msm: mpm: MPM driver support for devicetree/irqdomain

The current MPM driver works for targets where the interrupt controllers
operate in a legacy mode, where the linux irqs are at a constant offset
from the hardware irqs. On newer targets, the mapping within the
interrupt controllers are no longer restricted to legacy mode.

The change also address the interface changes in the MPM hardware
starting with 8974 chipsets.

Change-Id: Ide9b5bf7e29c94a85e37d04cd0064864b89f7c5c
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>