Rename signiture algorithm macros to better suite with TLS 1.2

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index ea1e6ba..34817d9 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -7666,8 +7666,10 @@
 
     for( i = 0; received_sig_algs[i] != MBEDTLS_TLS_SIG_NONE; i++ )
     {
-        if( sig_alg == MBEDTLS_SSL_SIG_FROM_SIG_ALG( received_sig_algs[i] ) )
-            return MBEDTLS_SSL_HASH_FROM_SIG_ALG( received_sig_algs[i] );
+        if( sig_alg == MBEDTLS_SSL_TLS12_SIG_ALG_FROM_SIG_AND_HASH_ALG(
+                            received_sig_algs[i] ) )
+            return MBEDTLS_SSL_TLS12_HASH_ALG_FROM_SIG_AND_HASH_ALG(
+                        received_sig_algs[i] );
     }
 
     return( MBEDTLS_SSL_HASH_NONE );