Rename tls13 prefix to fix coding issues

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ecdh.c b/library/ecdh.c
index 8884260..27e5d73 100644
--- a/library/ecdh.c
+++ b/library/ecdh.c
@@ -806,9 +806,9 @@
 #endif
 }
 
-static int ecdh_tls1_3_read_public_internal( mbedtls_ecdh_context_mbed *ctx,
-                                             const unsigned char *buf,
-                                             size_t blen )
+static int ecdh_tls13_read_public_internal( mbedtls_ecdh_context_mbed *ctx,
+                                            const unsigned char *buf,
+                                            size_t blen )
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     const unsigned char *p = buf;
@@ -838,15 +838,15 @@
 /*
  * Parse and import the client's TLS 1.3 public value
  */
-int mbedtls_ecdh_tls1_3_read_public( mbedtls_ecdh_context *ctx,
-                                     const unsigned char *buf,
-                                     size_t blen )
+int mbedtls_ecdh_tls13_read_public( mbedtls_ecdh_context *ctx,
+                                    const unsigned char *buf,
+                                    size_t blen )
 {
     ECDH_VALIDATE_RET( ctx != NULL );
     ECDH_VALIDATE_RET( buf != NULL );
 
 #if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
-    return( ecdh_tls1_3_read_public_internal( ctx, buf, blen ) );
+    return( ecdh_tls13_read_public_internal( ctx, buf, blen ) );
 #else
     switch( ctx->var )
     {
@@ -855,8 +855,8 @@
             return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
 #endif
         case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
-            return( ecdh_tls1_3_read_public_internal( &ctx->ctx.mbed_ecdh,
-                                                      buf, blen ) );
+            return( ecdh_tls13_read_public_internal( &ctx->ctx.mbed_ecdh,
+                                                     buf, blen ) );
         default:
             return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
     }