PackageManager: Add FEATURE_CAMERA_AR

This feature requires a device to have at least one camera that
supports the new MOTION_TRACKING capability.

This capability represents a minimal set of features to make feature
tracking applications able to work acceptably well.

Test: Builds
Bug: 63629224
Change-Id: I776dad2b706259191ddb1570be7bb30051cc773f
2 files changed