camera: clean up wrapper code

* Clean up formatting, warnings, style, logging, etc.

Change-Id: Ie0757befa341e209e2b552b42bffee6b52d8df0a
camera: Remove ZSL related code

We are probably safe to remove this workaround for ZSL cameras
camera: fix possible memory leak

Change-Id: I23dca14c2565f66f0e6577076c9286e0cf72c71d