HDMI: Avoid to interrupt standby process by action timeout

SystemAudioInitiationActionFromAvr requests for the current active
source before starting to query the TV for SAM support. If no other
device answer, the DUT will broadcast <AS>.

This is an issue in CTS, where no other CEC-enabled device is connected in the network. Broadcasting `<AS>` will interrupt the standby process failing the specific test.

Bug: 336707943
Test: atest com.android.server.hdmi && run cts -m
CtsHdmiCecHostTestCases -t
android.hdmicec.cts.playback.HdmiCecTvPowerToggleTest#cectTvPowerToggleTest_asleep_tvOn

Change-Id: Idb4fdfa9f39d9a3d1f566ab84263397f06b56107