Power: Add guard condition for maximum wakeup reasons

Ensure the array for the wakeup reason IRQs does not overflow.

Change-Id: Iddc57a3aeb1888f39d4e7b004164611803a4d37c
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
(cherry picked from commit b5ea40cdfcf38296535f931a7e5e7bf47b6fad7f)
Git-commit: 8b531976d51c33d5ef83ca2637b08afc2ed51802
Git-repo: https://android.googlesource.com/kernel/common.git


Signed-off-by: Ian Maund <imaund@codeaurora.org>