tls: replace ECDH_C guards with new helpers

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/library/ssl_tls12_server.c b/library/ssl_tls12_server.c
index c49c97f..e052e36 100644
--- a/library/ssl_tls12_server.c
+++ b/library/ssl_tls12_server.c
@@ -273,9 +273,10 @@
     while (list_size > 0) {
         if (p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED ||
             p[0] == MBEDTLS_ECP_PF_COMPRESSED) {
-#if !defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_ECDH_C)
+#if !defined(MBEDTLS_USE_PSA_CRYPTO) && \
+            defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED)
             ssl->handshake->ecdh_ctx.point_format = p[0];
-#endif /* !MBEDTLS_USE_PSA_CRYPTO && MBEDTLS_ECDH_C */
+#endif /* !MBEDTLS_USE_PSA_CRYPTO && MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED */
 #if !defined(MBEDTLS_USE_PSA_CRYPTO) &&                             \
             defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
             mbedtls_ecjpake_set_point_format(&ssl->handshake->ecjpake_ctx,
@@ -1892,8 +1893,8 @@
 }
 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
 
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED) || \
+    defined(MBEDTLS_ECDSA_C) || defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
 static void ssl_write_supported_point_formats_ext(mbedtls_ssl_context *ssl,
                                                   unsigned char *buf,
                                                   size_t *olen)
@@ -1920,7 +1921,8 @@
 
     *olen = 6;
 }
-#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED || MBEDTLS_ECDSA_C ||
+          MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
 
 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
 static void ssl_write_ecjpake_kkpp_ext(mbedtls_ssl_context *ssl,
@@ -2349,8 +2351,8 @@
     ext_len += olen;
 #endif
 
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED) || \
+    defined(MBEDTLS_ECDSA_C) || defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
     const mbedtls_ssl_ciphersuite_t *suite =
         mbedtls_ssl_ciphersuite_from_id(ssl->session_negotiate->ciphersuite);
     if (suite != NULL && mbedtls_ssl_ciphersuite_uses_ec(suite)) {