fix PR9302 backporting issues

- psa_crypto_helpers.h

mbedtls-3.6 branch misses some crypto client changes that has
been done in the development branch since the LTS release. Therefore
CRYPTO_C guard here is more accurate than CRYPTO_CLIENT.

- entropy.h

In the development branch MBEDTLS_ENTROPY_BLOCK_SIZE is defined
when PSA_WANT_ALG_SHA_[256/512] is defined while in the mbedtls-3.6
branch is guarded by MBEDTLS_MD_CAN_SHA[256/512] which is slightly
different. Since MBEDTLS_ENTROPY_BLOCK_SIZE is used in some tests's
data files, we need to have it defined also if the related test
is skipped. Therefore we add the PSA_WANT_ALG_SHA conditions together
with the MBEDTLS_MD_CAN_SHA ones to mimic the development behavior.

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/include/mbedtls/entropy.h b/include/mbedtls/entropy.h
index 20fd687..6c64e3e 100644
--- a/include/mbedtls/entropy.h
+++ b/include/mbedtls/entropy.h
@@ -17,12 +17,13 @@
 
 #include "md.h"
 
-#if defined(MBEDTLS_MD_CAN_SHA512) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256)
+#if (defined(MBEDTLS_MD_CAN_SHA512) || defined(PSA_WANT_ALG_SHA_512)) && \
+    !defined(MBEDTLS_ENTROPY_FORCE_SHA256)
 #define MBEDTLS_ENTROPY_SHA512_ACCUMULATOR
 #define MBEDTLS_ENTROPY_MD  MBEDTLS_MD_SHA512
 #define MBEDTLS_ENTROPY_BLOCK_SIZE      64      /**< Block size of entropy accumulator (SHA-512) */
 #else
-#if defined(MBEDTLS_MD_CAN_SHA256)
+#if (defined(MBEDTLS_MD_CAN_SHA256) || defined(PSA_WANT_ALG_SHA_256))
 #define MBEDTLS_ENTROPY_SHA256_ACCUMULATOR
 #define MBEDTLS_ENTROPY_MD  MBEDTLS_MD_SHA256
 #define MBEDTLS_ENTROPY_BLOCK_SIZE      32      /**< Block size of entropy accumulator (SHA-256) */