stand: Parse all arguments passed by UEFI

Approved by:	imp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D36457

stand/efi/loader/main.c

@@ -720,7 +720,7 @@ parse_args(int argc, CHAR16 *argv[])
 	 * method is flawed for non-ASCII characters).
 	 */
 	howto = 0;
-	for (i = 1; i < argc; i++) {
+	for (i = 0; i < argc; i++) {
 		cpy16to8(argv[i], var, sizeof(var));
 		howto |= boot_parse_arg(var);
 	}