clocksource: exynos_mct: Fix too early ISR fire up on wrong CPU

clocksource: exynos_mct: Fix too early ISR fire up on wrong CPU

After hotplugging CPU1 the first interrupt handler for CPU1 oneshot
timer was called on CPU0 because it fired up before setting IRQ
affinity.

During setup of the MCT timers the clock event device should be
registered after setting the affinity for interrupt. This will prevent
starting the timer to early.

Additionally, if clock event device has interrupt set up, the
clockevents_config_and_register() will also set the affinity for it.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Change-Id: I64fee65b57106ad562f0ecc1160748a9548debad