drivers/rtc/rtc-mrst: fix suspend/resume

drivers/rtc/rtc-mrst: fix suspend/resume

The Moorestown RTC driver implements suspend and resume callbacks and
assigns them to the suspend and resume fields of the device_driver
struct.  These callbacks are never actually called by anything though.

Modify the driver to properly use dev_pm_ops so that the suspend and
resume functions are actually executed upon suspend/resume.

[[email protected]: device_driver.name is const char *]
Signed-off-by: Lars-Peter Clausen <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: Feng Tang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>