jflte: remove ZSL overlay

ZSL isn't fully/properly implemented into the Camera2 project right now;
removing this overlay fixes the preview freeze.

Needs further investigation within Camera2 project.

Also disabling the SamsungHDR overlay as well until that functionality is
implemented into the Camera2 project as well.

Change-Id: I670c988dabd083d63abccfddb0c6b907946c4343