bus: arm-ccn: Use hrtimer_start() again

hrtimer_start() will no longer defer already expired timers to the
softirq in 4.2, and the __hrtimer_start_range_ns() function is
getting removed, causing build errors when both the tip tree and
the arm-ccn changes are merged.

This changes the code back to using hrtimer_start, which will
do the right thing after this branch gets merged with the
timers update from tip.

As pointed out after a discussion on the mailing list, the result will
not be worse than the what was there before you pulled my updates, as
the code was using normal hrtimer_start(). It's just when I realised
that it should be pinned I looked at what x86 uncore pmu is doing and
shamelessly (and probably a bit mindlessly) copied the "do not wakeup"
version from there.

[arnd: update commit message]
Reported-by: Mark Brown <mark.brown@arm.com>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/bus/arm-ccn.c

@@ -921,9 +921,8 @@ static void arm_ccn_pmu_event_start(struct perf_event *event, int flags)
 	 * attribute).
 	 */
 	if (!ccn->irq)
-		__hrtimer_start_range_ns(&ccn->dt.hrtimer,
-				arm_ccn_pmu_timer_period(), 0,
-				HRTIMER_MODE_REL_PINNED, 0);
+		hrtimer_start(&ccn->dt.hrtimer, arm_ccn_pmu_timer_period(),
+				HRTIMER_MODE_REL_PINNED);
 
 	/* Set the DT bus input, engaging the counter */
 	arm_ccn_pmu_xp_dt_config(event, 1);