replace arm64 macro and aesce enable flag

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/gcm.c b/library/gcm.c
index 786290f..b06ca4a 100644
--- a/library/gcm.c
+++ b/library/gcm.c
@@ -97,7 +97,7 @@
     }
 #endif
 
-#if defined(MBEDTLS_AESCE_C) && defined(MBEDTLS_HAVE_ARM64)
+#if defined(MBEDTLS_AESCE_HAVE_CODE)
     if (MBEDTLS_AESCE_HAS_SUPPORT()) {
         return 0;
     }
@@ -208,7 +208,7 @@
     }
 #endif /* MBEDTLS_AESNI_HAVE_CODE */
 
-#if defined(MBEDTLS_AESCE_C) && defined(MBEDTLS_HAVE_ARM64)
+#if defined(MBEDTLS_AESCE_HAVE_CODE)
     if (MBEDTLS_AESCE_HAS_SUPPORT()) {
         unsigned char h[16];
 
@@ -885,7 +885,7 @@
         } else
 #endif
 
-#if defined(MBEDTLS_AESCE_C) && defined(MBEDTLS_HAVE_ARM64)
+#if defined(MBEDTLS_AESCE_HAVE_CODE)
         if (MBEDTLS_AESCE_HAS_SUPPORT()) {
             mbedtls_printf("  GCM note: using AESCE.\n");
         } else