It's possible to have RTC irq shared with other device (e.g.  t4240qds
board shares ds3232irq with phy one).  Handle this in driver.
Signed-off-by: NBharat Bhushan <Bharat.Bhushan@freescale.com>
Cc: Scott Wood <scottwood@freescale.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>