HDMI-CEC: Disable AVB when system audio device is TV

Currently there is no GTV supporting outgoing <Report Audio Status>.
Based on CEC specification 2.0, <Give Audio Status> and <Report Audio Status>
for both directions are enforced only for amplifier, so the case under
general TV supporting it might be rare. Given some non-GTV TVs not
responding <Feature Abort> causing volume issues, we should disable it
until outgoing <Report Audio Status> is enforced on TV.

Bug: b/406050353
Test: atest com.android.server.hdmi
Flag: EXEMPT bugfix
Change-Id: Id7635d5950b11a5d15b98cacb99b79e195a93120