HDMI: Improve behavior of TVs ignoring standby from non-active source

Currently, TVs ignore standby from non-AS devices only if another source reported <Active Source>. TVs can switch the active path to non-CEC connected devices which won't report <Active Source>. This patch is solving the issue.

Flag: EXEMPT bugfix
Bug: 364646168
Test: atest HdmiCecLocalDeviceTvTest
Change-Id: I0e731a0144ebb47a47fe4dc671bc1db5a6458883