msm: camera: sensor: Turn off the flash while flushing

Turn off the flash while flushing if the flushed request is
flash off and removed flush request ID validation in flush_all
scenario.

CRs-Fixed: 2667472
Change-Id: Iaf123f2f56117d7b7d1ef6d2291b0cde8c232d44
Signed-off-by: Anil Kumar Kanakanti <akanakan@codeaurora.org>