slim-msm-ngd: Add wake lock to avoid race with suspend and SSR

Add wake lock in SSR up notification handling to avoid race
condition between system suspend and SSR up handling sequence
which can result in un-clocked access.

Change-Id: I246fa70df53b0cb7acdfcadf9cfe2ce01a3bff6b
Signed-off-by: Prudhvi Yarlagadda <pyarlaga@codeaurora.org>