hrtimers: Make sure hrtimer_resolution is unsigned int

... in the !CONFIG_HIGH_RES_TIMERS case too. And thus fix warnings like
this one:

net/sched/sch_api.c: In function ‘psched_show’:
net/sched/sch_api.c:1891:6: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 6 has type ‘long int’ [-Wformat=]
      (u32)NSEC_PER_SEC / hrtimer_resolution);
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1433583000-32090-1-git-send-email-bp@alien8.deSigned-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>

include/linux/hrtimer.h

@@ -309,7 +309,7 @@ extern unsigned int hrtimer_resolution;
 # define MONOTONIC_RES_NSEC	LOW_RES_NSEC
 # define KTIME_MONOTONIC_RES	KTIME_LOW_RES
 
-#define hrtimer_resolution	LOW_RES_NSEC
+#define hrtimer_resolution	(unsigned int)LOW_RES_NSEC
 
 static inline void hrtimer_peek_ahead_timers(void) { }