RTC: Remove UIE emulation

RTC: Remove UIE emulation

Since we provide UIE interrupts via a rtc_timer, the old
emulation code can be removed.

Signed-off-by: John Stultz <[email protected]>
LKML Reference: <1290136329[email protected]>
Acked-by: Alessandro Zummo <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
CC: Alessandro Zummo <[email protected]>
CC: Thomas Gleixner <[email protected]>
CC: Richard Cochran <[email protected]>