Add foldable support for RouteInfo#getPresentationDisplay

In this CL, RouteInfo#getPresentationDisplay by following order:
1. Connected Wifi displays (Ex: chromecast)
2. Attached external displays (Ex: an external display plugged by HDMI)
3. Non-default built-in displays

Test: MediaRouteInfoTest
Bug: 130035480
Change-Id: Ib2dd63217ebe415c2bda57f60e42713ca325f56e