Add via padlock detection macro

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/padlock.h b/library/padlock.h
index b5f0d7d..ae5c486 100644
--- a/library/padlock.h
+++ b/library/padlock.h
@@ -42,6 +42,8 @@
 #if defined(MBEDTLS_HAVE_ASM) && defined(__GNUC__) && defined(__i386__) && \
     !defined(MBEDTLS_HAVE_ASAN)
 
+#define MBEDTLS_VIA_PADLOCK_HAVE_CODE
+
 #ifndef MBEDTLS_HAVE_X86
 #define MBEDTLS_HAVE_X86
 #endif