Static RRO package is designed to support resource overlay for system
server and they shouldn't be disabled or changed by a user.
The design details are in go/treble-static-rro.
Selection method for static RROs will be applied later when its design
is determined.
Test: building succeeded and tested on sailfish.
Bug: 35742444
Change-Id: I8cbf2fd37a73a24bf6ad291e2c5cf75a0fc757fc
0434289c45