Make dedup id mandatory for multiple routing type support

This enables identifying a mirroring MR2Info object and the
corresponding "remote one" as the same physical receiver device.

Bug: b/396403760
Bug: b/362507305
Test: atest CtsMediaBetterTogetherTestCases:android.media.router.cts.SystemMediaRoutingTest
Flag: com.android.media.flags.enable_mirroring_in_media_router_2
Change-Id: I54bf41ff9d5f6d87191a9862069fd9e3781ff152