Revert "torch: use camera interface"

Enabling torch flash via camera interface is too slow.
This reverts commit be772fc5e15f9d573ac0c5232aeda964bf76661c

Change-Id: I5ace0341832f426ec74159227dd49943bddb87f3
Merge commit '7bbccd2fbbab8d2bda844674264e2d86bae52d25' into jb43