sched/headers, timekeeping: Move the timer tick function prototypes to <linux/timekeeping.h>

Move the update_process_times() and xtime_update() prototypes to <linux/timekeeping.h>.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

include/linux/sched.h

@@ -180,7 +180,6 @@ extern cpumask_var_t cpu_isolated_map;
 
 extern int runqueue_is_locked(int cpu);
 
-extern void update_process_times(int user);
 extern void scheduler_tick(void);
 
 #define	MAX_SCHEDULE_TIMEOUT	LONG_MAX

include/linux/time.h

@@ -167,8 +167,6 @@ static inline bool timespec_inject_offset_valid(const struct timespec *ts)
 extern u32 (*arch_gettimeoffset)(void);
 #endif
 
-extern void xtime_update(unsigned long ticks);
-
 struct itimerval;
 extern int do_setitimer(int which, struct itimerval *value,
 			struct itimerval *ovalue);

include/linux/timekeeping.h

@@ -8,6 +8,10 @@
 void timekeeping_init(void);
 extern int timekeeping_suspended;
 
+/* Architecture timer tick functions: */
+extern void update_process_times(int user);
+extern void xtime_update(unsigned long ticks);
+
 /*
  * Get and set timeofday
  */