camera: Don't forcefully enable ZSL

Enabling ZSL without the app being aware of it is a bad idea, and can
lead to a 3rd party app trying to mix it with incompatible options with
unpredictable results. Disable it unless the camera explicitly requests
that feature.

Change-Id: Ia655f5185720cd69577c2c3006662df63e8535ef
Merge branch 'cm-11.0' into kk_mkt