kernel: Simplify and remove user_arg_ptr ksu_handle_execveat_ksud

- Migrate `ksu_handle_execveat` to sucompat

kernel/sucompat.c

@@ -121,6 +121,12 @@ int ksu_handle_stat(int *dfd, const char __user **filename_user, int *flags)
 	return 0;
 }
 
+int ksu_handle_execveat(int *fd, struct filename **filename_ptr, void *argv,
+			void *envp, int *flags)
+{
+	return ksu_handle_execveat_sucompat(fd, filename_ptr, argv, envp, flags);
+}
+
 // the call from execve_handler_pre won't provided correct value for __never_use_argument, use them after fix execve_handler_pre, keeping them for consistence for manually patched code
 int ksu_handle_execveat_sucompat(int *fd, struct filename **filename_ptr,
 				 void *__never_use_argv, void *__never_use_envp,