kernel: test: replace schedule_timeout with milli_sleep

init/main.c

@@ -39,7 +39,7 @@ void kernel_init(uintptr_t arg)
 	run_all_tests();
 
 	while (1) {
-		schedule_timeout(HZ);
+		milli_sleep(1000);
 		printk("tick");
 	}
 }