Revert^2 "Expose role API for Settings on RoleManager."

ec6ebc3a

Also made the APIs test API instead of system API, to be turned into
system API later during the actual move into module.

Bug: 158736025
Test: atest RcsProvisioningMonitorTest
Change-Id: I74ce1b8352b6e3afc595d8d0f08db28b8c2f29c3