SystemServer aidl: Remove dependency to framework

Bug: 288450479
Bug: 321804999
Test: atest ServiceBluetoothRoboTests
Test: m service-bluetooth | No-op change
      Flag testing will be done in follow-up, before flag rollout
Change-Id: I4adbf8fb0b5a598b1d3e8a3b9afa514885336919