Add test for AudioPoliciesDeviceRouteController

The new test is in a media routing specific directory
in order to add the new module to the pre and post
submit of the media routing related code.

Bug: 305199571
Test: atest AudioPoliciesDeviceRouteControllerTest
Change-Id: I0f447d3295c7e1665c5557e1448e440bb3039610
7 files changed