HDMI-CEC: Disable AVB for Playback Devices

Playback devices on U branch release was paused because
AVB is not properly supported for some TVs, resulting in
no sound coming out from the TV. Temproary disable AVB to
unblock the release.

Test: atest com.android.server.hdmi
Bug: b/403964156, b/406050353
Flag: EXEMPT tmp fix
Change-Id: I07d695924015078be2ea090fca5c85febf4fd974