TLS1.3: Add signature scheme pkcs1 v1.5

Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index b07d07a..0d54ae9 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -6376,6 +6376,7 @@
 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
     MBEDTLS_TLS13_SIG_RSA_PSS_RSAE_SHA256,
 #endif
+    MBEDTLS_TLS13_SIG_RSA_PKCS1_SHA256,
 
     MBEDTLS_TLS13_SIG_NONE
 };
@@ -6395,6 +6396,7 @@
 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
     MBEDTLS_TLS13_SIG_RSA_PSS_RSAE_SHA256,
 #endif
+    MBEDTLS_TLS13_SIG_RSA_PKCS1_SHA256,
 
     MBEDTLS_TLS13_SIG_NONE
 };