Disabled Accessibility services uid registration for auto

Accessibility services currently runs concurrently with assistant. This
causes issues in automotive where OEMs are running multiple assistants.
The main issue stems from rotaryservice (accessibility service in auto)
running as state bound to a foreground service. Thus assistant is always
listening, this causes issues for other assistant apps as they are
interupted by hotword mistriggers.

Bug: 233287010
Test: adb shell dumpsys media.audio_policy|grep "Accessibility UID" -A10
Change-Id: I6820b6b3ebfbafb0bb8e5ab99a6f3c2189305017