msm: 8625: Add support for the M2A_2 fiq handler

The FIQ handler gets triggered when the M2A_2
interrupt is fired by the NON-HLOS. The  FIQ
handler saves the CPU context and helps in
debugging the watch dog timeout issues.

Change-Id: I570d7f15f85bedc186262cef3ecff18cafda2464
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>