ARM: SAMSUNG: Updates RTC register for support Alarm IRQ and Time Tick.

This patch updates RTC registers for support Alarm IRQ and Time Tick.

Signed-off-by: Atul Dahiya <atul.dahiya@samsung.com>
Signed-off-by: Taekgyun Ko <taeggyun.ko@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>