Remove pkcs1 from key cert and sig alg map

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 3fa303b..c5717c0 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -4916,8 +4916,7 @@
                                     sig_alg,
                                     mbedtls_ssl_sig_alg_to_str( sig_alg ) ) );
 
-        if( ! mbedtls_ssl_sig_alg_is_supported( ssl, sig_alg ) ||
-            ! mbedtls_ssl_sig_alg_is_offered( ssl, sig_alg ) )
+        if( ! mbedtls_ssl_sig_alg_is_supported( ssl, sig_alg ) )
             continue;
 
         MBEDTLS_SSL_DEBUG_MSG( 4, ( "valid signature algorithm: %s",