Display Bluetooth Disconnected Message

The goal is to communicate an error state which indicates that Bluetooth is disconnected. The pop-up that prompts the user to connect to Bluetooth does not appear again on re-entering the app after it has been dismissed. This has been fixed by creating several statuses which
indicate error conditions, download pending or success statuses. The
specific status NO_DEVICE_CONNECTED will allow for the "Bluetooth is
disconnected" message to display by returning a null result.

Tag: #stability
Bug: 275561845
Test: atest AvrcpControllerTest
(cherry picked from https://android-review.googlesource.com/q/commit:13f31c651f782cdd2c6f068013f50fce58c124fa)
Merged-In: I6fb279d49db4d6cdbc0850a684a22033390b557e
Change-Id: I6fb279d49db4d6cdbc0850a684a22033390b557e