rtc: rk8xx: update rtc

1.Resolve unresponsive key interrupt issues:
If the powerkey driver is initialized prior to the RTC driver,
forcibly masking the key-press interrupt in the RTC driver will
res

rtc: rk8xx: update rtc

1.Resolve unresponsive key interrupt issues:
If the powerkey driver is initialized prior to the RTC driver,
forcibly masking the key-press interrupt in the RTC driver will
result in missed powerkey interrupts.

2.Use virq for interrupt.

Change-Id: I98f4c47187eec3b7918809181e5d93218ceaa5b9
Signed-off-by: Shengfei Xu <xsf@rock-chips.com>

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rtc: add rk8xx rtc support

support rtc alarm interrupt and alarm trigger power up.

Change-Id: I7752f173d524f579b57b862d2788296ab1486c14
Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>