HDMI: Do not change Active Source status on all <Routing Change> messages

If the device is AS and received a <Routing Change> message to a PA in the same active path do not change the Active Source status.

E.g.: TV [0.0.0.0] ------ Switch [2.0.0.0] ------ OTT [2.1.0.0] (AS)
TV sends <Routing Change>[2.0.0.0] -> OTT is still AS
TV sends <Routing Change>[0.0.0.0] -> OTT is not AS.
TV sends <Routing Change>[3.0.0.0] -> OTT is not AS.

Test: make && atest HdmiCecLocalDevicePlaybackTest
Bug: 292207388
Change-Id: Ie431892e61e617762961696a533d0adc3655b77f