msm: gss-8064: Invoke SSR from within the watchdog IRQ handler

To account for corner cases during system suspend, the
subsystem restart API needs to be invoked directly
from within the context of the watchdog interrupt
handler. Call subsystem_restart from within the gss
watchdog bite handler instead of scheduling a work
item to do the same.

Change-Id: I52b5eb0f899b82df1be6207e9256a5aa739ecbc3
CRs-Fixed: 367957
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>