Merge changes Id69b2c8d,I6dc89d7c,I61ffc69a,Ib46f2106,I9b2f1b15, ...

* changes:
  bta/test: Extend gatt queue mock
  bta/test: Improve gatt mock api
  bt: Minor clang-format
  bt: Minor log fix
  bta/test: Add CSIS mocks
  bta/test: Add group mocks for unit tests
  gatt: Notify all gatt clients about encryption change