msm:camera: Fix liveshot stop logic

Injected register-update when liveshot is completed to turn off AXI.
Ensure register-update is independently set instead of
waiting for other event to set the register-update bit

Change-Id: I2484701e2b2bc0d8ad4d8a22e9b45b1e643a587b
Signed-off-by: Ryan Chan <clchan@codeaurora.org>