Revert "Expose role API for Settings on RoleManager."

Revert submission 13261069-role-settings-api

Reason for revert: Might be breaking RcsProvisioningMonitorTest
Bug: 177227549
Test: RcsProvisioningMonitor
Reverted Changes:
Idbd0db119:Expose role API for Settings on RoleManager.
Iafe1d2460:Expose role API for Settings on RoleManager.
I6a3e5a26c:Expose role API for Settings on RoleManager.

Change-Id: Ic48c562e8249ca43e7c594f55d94ba190540be22