Remove sl4n

Only the bluetooth facade was compiled and this depends
on some code of the native bluetooth service that is
removed alongside this CL

Test: TreeHugger
Bug: 263885771
Change-Id: Ib85586b4b5b5712badc945e52c01b08e2e7fbbe5
172 files changed
tree: 51fe9cb4ad39cb6bed2709c40cc78bc213267f6e
  1. PMC/
  2. UID/
  3. OWNERS
  4. PREUPLOAD.cfg