Add role initialization to RoleControllerService.

This change adds RoleManager.setRoleNamesFromController() to allow
RoleControllerService to initialize the roles for a user. This change
also fixes the persistence of roles by calling writeAsyncLocked().

Bug: 110557011
Test: build
Change-Id: I921b6aa691478ca4c0dd1a75fc929a96ce1e7df5