power: qpnp-smbcharger: Fix the variable holding irq number

The irq_numbers are used at multiple locations to enable/disable
the interrupts. Make sure the variable holding the numbers are initialized
correctly.

Change-Id: Id6ca64a53aeaa01bc643400a20e75e9296624e16
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>