camera_common: add TORCH_MODE_STATUS_OFF

Add TORCH_MODE_STATUS_OFF for the case when HAL has to turn off the
torch mode that was turned on by a previous set_torch_mode() call
in order to turn on the torch mode for the current set_torch_mode()
call.

Bug: 2682206
Change-Id: Ia2f717ffaca8c4346ec5fcdf73895160f700f067
1 file changed