msm: camera: flash: Add support for flash stream off

- Apply flash off register settings at the time of stream off.
- Add support to send fire command in initial config command.

CRs-Fixed: 2998772
Change-Id: I8897a68e637d283afd98e386b6a7b1fbaaf63c61
Signed-off-by: shiwgupt <shiwgupt@codeaurora.org>