[vim] remove vim expandtab comments on most of the files

kernel/debug.c

@@ -240,5 +240,3 @@ static int cmd_kevlog(int argc, const cmd_args *argv)
 #endif
 
 #endif // WITH_KERNEL_EVLOG
-
-// vim: set noexpandtab:

kernel/mp.c

@@ -76,6 +76,3 @@ enum handler_return mp_mbx_reschedule_irq(void)
     return (mp.active_cpus & (1U << cpu)) ? INT_RESCHEDULE : INT_NO_RESCHEDULE;
 }
 #endif
-
-// vim: set noexpandtab:
-

kernel/semaphore.c

@@ -97,5 +97,3 @@ status_t sem_timedwait(semaphore_t *sem, lk_time_t timeout)
     THREAD_UNLOCK(state);
     return ret;
 }
-
-/* vim: set noexpandtab: */

kernel/thread.c

@@ -1270,5 +1270,3 @@ const struct __debugger_info__ {
     .off_waitq = __builtin_offsetof(thread_t, blocking_wait_queue),
 };
 #endif
-
-/* vim: set ts=4 sw=4 noexpandtab: */

kernel/timer.c

@@ -309,6 +309,3 @@ void timer_init(void)
     platform_set_periodic_timer(timer_tick, NULL, 10); /* 10ms */
 #endif
 }
-
-/* vim: set noexpandtab */
-