Add AttributionSource to BinderTests missing them

This updates the unit tests to be more reflective of what they are
testing. AttributionSource is not expected to be null.

Bug: 394958283
Test: atest AvrcpControllerServiceBinderTest
Test: atest HeadsetClientServiceBinderTest
Test: atest HidHostServiceBinderTest
Test: atest BluetoothMapServiceBinderTest
Test: atest MapClientServiceBinderTest
Test: atest PanServiceBinderTest
Test: atest BluetoothPbapServiceBinderTest
Flag: EXEMPT refactor no-op
Change-Id: I9ece1a3619da9df3ad65d57011e12690acf1b6e2