Revert "Revert "Camera: Adds support for meta data callbacks""

This reverts commit b71b0060052b3d2b33902dc69c6bd23aa88111a6.

Now it works :)

Change-Id: I6bd0b75d07026f601c4e9b71b3e62a8ca75c37b9
Merge remote-tracking branch 'omni/android-4.4' into android-4.4