qcom: ssr: Add support to disable response on SSR failures

Add a new module parameter, "disable_restart_work" to
allow users to disable any work that happens during an
SSR. When set to the magic value, 0x9889deed, the call
to subsystem_restart_dev() returns immediately without
doing any restart work.

Change-Id: Ia9d7316cdf6447a07b76b92dd90e803062b9a6dd
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>