Revert "Revert "Camera: Enable Histogram feature.""

This reverts commit 77c19b0506e8bd50bad7923a2c1f9b7837852d77.
Revert "Revert "CameraClient: Enables meta data notifications""

This reverts commit 6da603b4620650c5e3473054870dc78081041f19.
Revert "Revert "CameraService: Adds support for longshot mode""

This reverts commit 8301a6fc3a63c24fab601ad548331498b438fbe7.