sched: add timer tasks and schedule_timeout()

init/main.c

@@ -1,5 +1,6 @@
 #include <stdint.h>
 #include <socks/init.h>
+#include <socks/clock.h>
 #include <socks/panic.h>
 #include <socks/test.h>
 #include <socks/printk.h>
@@ -37,9 +38,8 @@ void kernel_init(uintptr_t arg)
 
 	run_all_tests();
 
-	current_thread()->tr_state = THREAD_SLEEPING;
-
 	while (1) {
-		ml_cpu_pause();
+		schedule_timeout(HZ);
+		printk("tick");
 	}
 }