spmi-pmic-arb: add support to dispatch interrupt based on IRQ status

Current implementation of SPMI arbiter dispatches interrupt based on the
Arbiter's accumulator status, in some cases the accumulator status may
remain zero and the interrupt remains un-handled. Add logic to dispatch
interrupts based Arbiter's IRQ status if the accumulator status is zero.

CRs-Fixed: 2934741
Change-Id: I068f5c7d33758063878721d7cce1308fa803e3bd
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>
[collinsd: fix merge conflict]
Signed-off-by: David Collins <collinsd@codeaurora.org>