SnapdragonCamera: Only release shutter for main cam

Only release shutter when main camera is unlocked. Queueing two
runnables can result in race condition where shutter is re-enabled
after being disabled due to shutter click.

CRs-Fixed: 1068525
Change-Id: I70def909e4c2c0eafc15e31475992248da3b74b7
1 file changed