Implement the suspend/resume function in order to control rtc's irq_wake flag and handle as wakeup source.
Signed-off-by: NHenry Chen <henryc.chen@mediatek.com>
Acked-by: NEddie Huang <eddie.huang@mediatek.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>