To prepare for future work which will plumb AttributionSource values
through all remaining AIDLs, we need profiles to interact directly
with the specific BluetoothAdapter they were created from. This is
how we'll ensure that the relevant AttributionSource can be chained
down from the original Context they're obtained from.
This change also marks getDefaultAdapter() as deprecated to clearly
communicate that BluetoothManager.getAdapter() is the best-practice
path to obtaining a correctly scoped BluetoothAdapter instance.
Bug: 183626112
Test: atest BluetoothInstrumentationTests
Change-Id: I1e15170d7679019bbb6e396279d6e633e3dad4d6
efe1110be8