bluetooth.te

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

Test: No change to policy according to sesearch, except for
      disappearance of all allow rules to do with bluetooth_current
      except those created by other domains' allow rules referencing
      bluetooth domain from public and vendor policy.
Bug: 31364497

Change-Id: I3521b74a1a9f6c5a5766b358e944dc5444e3c536