HFP: Send caller ID in +CLIP command (1/4)

* Modify BluetoothHeadset so that phoneStateChanged method can
  provide caller display name

Bug: 111378831
Test: runtest bluetooth, runtest -x BluetoothPhoneServiceTest.java
Change-Id: Ibc3611a50ec9f103fd235dde606ecbd10657e014
1 file changed