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function my_et_add_viewport_meta(){
	echo '<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=2.0, user-scalable=1" />';
}
add_action( 'wp_head', 'my_et_add_viewport_meta' , 11 );

function my_et_add_viewport_meta_disable() {
	remove_action( 'wp_head', 'et_add_viewport_meta' );
}
add_action( 'after_setup_theme', 'my_et_add_viewport_meta_disabled', 50 );