msm: camera: Fix led release on Sensor Shutdown

On sensor shutdown, flash was calling flash_high.
When camera daemon is killed, this flash_high was getting
invoked which resulted the flash to fire.
This is now fixed by calling flash_release.

Change-Id: Iace1fee56253dc43c1525a89a2b6e369065ca7aa
Signed-off-by: Deepak Kaushal <dkaushal@codeaurora.org>