Revert "AudioService: synchronize audio mode and focus for Telecom"

This reverts commit 15f9e56e.

Bug: 375018522
Bug: 350415723
Flag: EXEMPT bug fix
Test: make
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:5754baa4be5715b164d3a924e2cd0b327823ee74)
Merged-In: Id8b8a7933976c2a98f42ae23775f1eee66462b92
Change-Id: Id8b8a7933976c2a98f42ae23775f1eee66462b92