CameraHAL: Disable AF assist in stop preview

If AF assist is ON when switching to video mode and flash is
not set to OFF before switching, then the torch mode is
somehow turned ON and never turns OFF.

Since AF assist is not used after stopping preview,
set it to OFF

Change-Id: I44c9e6359a0488d235929f6bf1cdd4b257565caf
Signed-off-by: Sundar Raman <sunds@ti.com>
1 file changed