[Role Logic Move] Add migration logic for isRoleFallbackEnabled

Migrate the isRoleFallbackEnabled preference to system server as a part
of the role logic move project. We only do the migration if it's V+. On
the system server side it will check the existing preference in
SharedPreference and migrate for all roles for the user.

API-Coverage-Bug: 314281553
Bug: 302563864
Test: RolePersistenceTest and RoleManagerTest
Change-Id: Ib24ebb8211359a652e52007fecf79a2390575e9c