clocksource/drivers/tegra: Allow timer irq affinity change

Allow the timer core to change the smp affinity of the broadcast timer
irq by setting CLOCK_EVT_FEAT_DYNIRQ flag.

This reduces interrupt pressure and wakeups on CPU0 as well as vastly
reducing the number of timer broadcast IPIs.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/clocksource/tegra20_timer.c

@@ -96,7 +96,8 @@ static struct clock_event_device tegra_clockevent = {
 	.name			= "timer0",
 	.rating			= 300,
 	.features		= CLOCK_EVT_FEAT_ONESHOT |
-				  CLOCK_EVT_FEAT_PERIODIC,
+				  CLOCK_EVT_FEAT_PERIODIC |
+				  CLOCK_EVT_FEAT_DYNIRQ,
 	.set_next_event		= tegra_timer_set_next_event,
 	.set_state_shutdown	= tegra_timer_shutdown,
 	.set_state_periodic	= tegra_timer_set_periodic,