Replace `MBEDTLS_MD_CAN_SHA512` with `PSA_WANT_ALG_SHA_512`

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/tf-psa-crypto/drivers/builtin/include/mbedtls/entropy.h b/tf-psa-crypto/drivers/builtin/include/mbedtls/entropy.h
index 57af02a..964a996 100644
--- a/tf-psa-crypto/drivers/builtin/include/mbedtls/entropy.h
+++ b/tf-psa-crypto/drivers/builtin/include/mbedtls/entropy.h
@@ -17,7 +17,7 @@
 
 #include "md.h"
 
-#if defined(MBEDTLS_MD_CAN_SHA512) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256)
+#if 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) */