manifest: track own Launcher3

needed for : -
 1. fix FC on 10" tablets due to missing layout heights and widths
 2. make it a priv-app so that widgets of priv-apps can show up here
 3. add launcher options (if we do so in future)

Change-Id: Idb9f3d9c91a2a799496febbde5bf4a7d6eddc701
Signed-off-by: Arnav Gupta <championswimmer@aokp.co>