rtc: pm8xxx: move device_init_wakeup() before rtc_register

Setup wakeup capability before rtc_register to ensure the rtc class core
properly sets up our 'wakealarm' sysfs attribute.

Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>