library: Move mbedtls_ecc helper functions to psa_util

Move the mbedtls_ecc helper functions from psa_core to psa_util.
These files are not implemented as part of the PSA API and should not
be part of the PSA crypto implementation.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>
diff --git a/include/mbedtls/psa_util.h b/include/mbedtls/psa_util.h
index 643e8aa..5f6a053 100644
--- a/include/mbedtls/psa_util.h
+++ b/include/mbedtls/psa_util.h
@@ -14,6 +14,8 @@
 
 #include "mbedtls/build_info.h"
 
+#include "psa/crypto.h"
+
 #if defined(MBEDTLS_PSA_CRYPTO_C)
 
 /* Expose whatever RNG the PSA subsystem uses to applications using the
@@ -100,5 +102,53 @@
 
 #endif /* !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) */
 
+/** \defgroup psa_tls_helpers TLS helper functions
+ * @{
+ */
+#if defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY)
+#include <mbedtls/ecp.h>
+
+/** Convert an ECC curve identifier from the Mbed TLS encoding to PSA.
+ *
+ * \note This function is provided solely for the convenience of
+ *       Mbed TLS and may be removed at any time without notice.
+ *
+ * \param grpid         An Mbed TLS elliptic curve identifier
+ *                      (`MBEDTLS_ECP_DP_xxx`).
+ * \param[out] bits     On success, the bit size of the curve.
+ *
+ * \return              The corresponding PSA elliptic curve identifier
+ *                      (`PSA_ECC_FAMILY_xxx`).
+ * \return              \c 0 on failure (\p grpid is not recognized).
+ */
+psa_ecc_family_t mbedtls_ecc_group_to_psa(mbedtls_ecp_group_id grpid,
+                                          size_t *bits);
+
+/** Convert an ECC curve identifier from the PSA encoding to Mbed TLS.
+ *
+ * \note This function is provided solely for the convenience of
+ *       Mbed TLS and may be removed at any time without notice.
+ *
+ * \param curve         A PSA elliptic curve identifier
+ *                      (`PSA_ECC_FAMILY_xxx`).
+ * \param bits          The bit-length of a private key on \p curve.
+ * \param bits_is_sloppy If true, \p bits may be the bit-length rounded up
+ *                      to the nearest multiple of 8. This allows the caller
+ *                      to infer the exact curve from the length of a key
+ *                      which is supplied as a byte string.
+ *
+ * \return              The corresponding Mbed TLS elliptic curve identifier
+ *                      (`MBEDTLS_ECP_DP_xxx`).
+ * \return              #MBEDTLS_ECP_DP_NONE if \c curve is not recognized.
+ * \return              #MBEDTLS_ECP_DP_NONE if \p bits is not
+ *                      correct for \p curve.
+ */
+mbedtls_ecp_group_id mbedtls_ecc_group_of_psa(psa_ecc_family_t curve,
+                                              size_t bits,
+                                              int bits_is_sloppy);
+#endif /* PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY */
+
+/**@}*/
+
 #endif /* MBEDTLS_PSA_CRYPTO_C */
 #endif /* MBEDTLS_PSA_UTIL_H */
diff --git a/include/psa/crypto_extra.h b/include/psa/crypto_extra.h
index ef29b77..f7207a1 100644
--- a/include/psa/crypto_extra.h
+++ b/include/psa/crypto_extra.h
@@ -557,53 +557,6 @@
 
 /**@}*/
 
-/** \defgroup psa_tls_helpers TLS helper functions
- * @{
- */
-#if defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY)
-#include <mbedtls/ecp.h>
-
-/** Convert an ECC curve identifier from the Mbed TLS encoding to PSA.
- *
- * \note This function is provided solely for the convenience of
- *       Mbed TLS and may be removed at any time without notice.
- *
- * \param grpid         An Mbed TLS elliptic curve identifier
- *                      (`MBEDTLS_ECP_DP_xxx`).
- * \param[out] bits     On success, the bit size of the curve.
- *
- * \return              The corresponding PSA elliptic curve identifier
- *                      (`PSA_ECC_FAMILY_xxx`).
- * \return              \c 0 on failure (\p grpid is not recognized).
- */
-psa_ecc_family_t mbedtls_ecc_group_to_psa(mbedtls_ecp_group_id grpid,
-                                          size_t *bits);
-
-/** Convert an ECC curve identifier from the PSA encoding to Mbed TLS.
- *
- * \note This function is provided solely for the convenience of
- *       Mbed TLS and may be removed at any time without notice.
- *
- * \param curve         A PSA elliptic curve identifier
- *                      (`PSA_ECC_FAMILY_xxx`).
- * \param bits          The bit-length of a private key on \p curve.
- * \param bits_is_sloppy If true, \p bits may be the bit-length rounded up
- *                      to the nearest multiple of 8. This allows the caller
- *                      to infer the exact curve from the length of a key
- *                      which is supplied as a byte string.
- *
- * \return              The corresponding Mbed TLS elliptic curve identifier
- *                      (`MBEDTLS_ECP_DP_xxx`).
- * \return              #MBEDTLS_ECP_DP_NONE if \c curve is not recognized.
- * \return              #MBEDTLS_ECP_DP_NONE if \p bits is not
- *                      correct for \p curve.
- */
-mbedtls_ecp_group_id mbedtls_ecc_group_of_psa(psa_ecc_family_t curve,
-                                              size_t bits,
-                                              int bits_is_sloppy);
-#endif /* PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY */
-
-/**@}*/
 
 /** \defgroup psa_external_rng External random generator
  * @{