msm: camera: flash: Add flash off operation in shutdown

There is high chances, when camera server crash flash may not have
flash off request scheduled with CRM. In case of torch on, followed
by shutdown sequence, if flash off request is not scheduled, flash
remains turned on. This change adds flash off operation, in case
of shutdown.

CRs-Fixed: 2691916
Change-Id: I472f2b204b93d0cdc3d8a1f14fff29ab479e4588
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>