Display disconnected bluetooth devices only when local output device is available.

-If media app does not support cast->phone transferring, local output
audio device is unavailable. Disconnected bluetooth devices should be
also unavilable.
-These types are local output audio devices defined in MediaRoute2Info:
TYPE_BUILTIN_SPEAKER
TYPE_WIRED_HEADSET
TYPE_WIRED_HEADPHONES
TYPE_USB_DEVICE
TYPE_USB_HEADSET
TYPE_USB_ACCESSORY
TYPE_DOCK
TYPE_HDMI
-Update test case

Bug: 163095048
Test: make -j50 RunSettingsLibRoboTests
Change-Id: I0ceea496d677e514cce0e773a8731bb4eeff874d