Camera: Changes to fix Fullsize livesnapshot issue

Crash seen because buf done was issued on thumnail buffer.
We don't have thumbnail for fullsize snapshot. Change is to
avoid calling queue buffer on thumnail in in full size snapshot case.
Also change to enable fullsize snapshot based on h/w capability

Change-Id: Ie3179baa5e66621cff0e3be37533206a70113938