Rename hash max sizes for consistency

Use "hash" throughout the library, not "md" as in Mbed TLS.
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index a88e02f..69deba1 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -1,7 +1,6 @@
 /* BEGIN_HEADER */
 #include <stdint.h>
 #include "psa/crypto.h"
-#include "mbedtls/md.h"
 
 #if(UINT32_MAX > SIZE_MAX)
 #define PSA_CRYPTO_TEST_SIZE_T_RANGE( x ) ( ( x ) <= SIZE_MAX )
@@ -212,7 +211,7 @@
 void hash_finish( int alg_arg, data_t *input, data_t *expected_hash )
 {
     psa_algorithm_t alg = alg_arg;
-    unsigned char actual_hash[MBEDTLS_MD_MAX_SIZE];
+    unsigned char actual_hash[PSA_HASH_MAX_SIZE];
     size_t actual_hash_length;
     psa_hash_operation_t operation;