Use ecdh_setup instead of ecp_group_load

Align files with development to ensure the same state of repositories.

Author: AndrzejKurek

library/ssl_srv.c

@@ -3088,8 +3088,8 @@ static int ssl_prepare_server_key_exchange( mbedtls_ssl_context *ssl,
 
         MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDHE curve: %s", (*curve)->name ) );
 
-        if( ( ret = mbedtls_ecp_group_load( &ssl->handshake->ecdh_ctx.grp,
-                                       (*curve)->grp_id ) ) != 0 )
+        if( ( ret = mbedtls_ecdh_setup( &ssl->handshake->ecdh_ctx,
+                                        (*curve)->grp_id ) ) != 0 )
         {
             MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecp_group_load", ret );
             return( ret );

tests/suites/test_suite_ecdh.function

@@ -278,7 +278,7 @@ void ecdh_exchange( int id )
     mbedtls_ecdh_init( &cli );
     memset( &rnd_info, 0x00, sizeof( rnd_pseudo_info ) );
 
-	TEST_ASSERT( mbedtls_ecp_group_load( &srv.grp, id ) == 0 ); 
+	TEST_ASSERT( mbedtls_ecdh_setup( &srv, id ) == 0 );
 
     memset( buf, 0x00, sizeof( buf ) ); vbuf = buf;
     TEST_ASSERT( mbedtls_ecdh_make_params( &srv, &len, buf, 1000,