This leaves only the existence of bluetoothdomain attribute as public
API. All other rules are implementation details of this attribute's
policy and are thus now private.

Test: No change to policy according to sesearch, except for
      disappearance of all allow bluetoothdomain bluetooth_current
      rule (as expected).
Bug: 31364497

Change-Id: I0edfc30d98e1cd9fb4f41a2900954d9cdbb4db14