msm: camera: flash: Add torch handling in early PCR

Reentering video recording usecase with flash mode on, flashlow
operation triggered in early PCR to fire Torch. This change
adds FIRELOW opcode to support fire Torch.

Change-Id: Iffc6ad58b31bb27108af890796897dd37240253d
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>