cmd: tmenu: Add tmenu command for touch menu user interface

Shows a menu of items that can be controlled using touch panel.
This is useful for touch based devices like tablets to select
alternative boot options (multi-boot).

Signed-off-by: Ondrej Jirman <megous@megous.com>

boot/pxe_utils.c

@@ -783,6 +783,11 @@ cleanup:
 	return 1;
 }
 
+int pxe_label_boot(struct pxe_context *ctx, struct pxe_label *label)
+{
+	return label_boot(ctx, label);
+}
+
 /** enum token_type - Tokens for the pxe file parser */
 enum token_type {
 	T_EOL,