BluetoothMap APIs, disallow null device input for setConnectionPolicy,
getConnectionPolicy, and getConnectionState in BluetoothHidHost, and
BluetoothMap implements AutoCloseable, its close() method is public, and
utilizes a CloseGuard.
Bug: 149238030
Test: Manual
Merged-In: I8add9e26afcaf1a988c15e3cc7f8c446491f0686
Change-Id: I8add9e26afcaf1a988c15e3cc7f8c446491f0686