Respect CONNECTING device state from the MediaRouter.

This allows the Output Switcher and the Suggested device chip to show
the loading spinner for a device when it's in the active connecting
state.

Fix: 425777190
Flag: EXEMPT bugfix
Test: on a physical device, atest InfoMediaManagerTest
Change-Id: Id990d39784a05aa505811a80b6b32b9d91a5997b