msm: subsystem-restart: Add structure to be passed in with notifications

Add a 'notif_data' structure which is sent with the subsystem
restart notifications. The drivers that have registered with the
framework for its notifications can use this structure to decide
upon specific tasks at their end.

CRs-Fixed: 625452

Change-Id: I0bfc277e569a72b2884837829009e96a51399874
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>