Bluetooth: Rename bluetooth property to support new P Treble rules

- Renamed the property persist.vendor.bt.connect.peer_earbud to
  persist.vendor.btstack.connect.peer_earbud to support new P
  Treble rules.

 Conflicts:
	packages/SettingsLib/src/com/android/settingslib/bluetooth/CachedBluetoothDevice.java

CRs-Fixed: 2277397
Change-Id: I45dc740a45195154e2fe2a88a0384181fd0c7907
Signed-off-by: Volodymyr Zhdanov <wight554@gmail.com>