HDMI: Ignore <Routing Information> with PA equal to sender's PA

Ignore <Routing Information> messages pointing to the same physical
address as the message sender. In this case, we shouldn't consider the
sender to be the active source.
In b/321771821#comment7 we have seen a
soundbar that sends this message confusing ADT-4 sending it to standby
on active source lost.

Test: atest HdmiCecLocalDevicePlaybackTest
Bug: 321771821
Change-Id: Idcfeccfba0488bb7305d4c4c3dade989c309e6a5