power: smb1360: Check the IRQ status before disabling it

There is a chance that the disable_irq_nosync() function in
smb1360_stat_handler() being called multiply times continuously, it
causes the enable_irq() in resume() function won't be able to take the
IRQ back to enable status, and the IRQ will be disabled forever.

Check the IRQ status before disabling it to make sure the balance
enable_irq()/disable_irq() being called.

CRs-Fixed: 817073
Change-Id: I29edcc34f29b93c5656f72f03b3269845aa8c134
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>