Reapply "Use compat framework to gate system managed media servic..."

This reverts commit 68394167.

Test: atest cts/tests/app/src/android/app/cts/ActivityManagerNotifyMediaFGSTypeTest.java
      atest cts/hostsidetests/appcompat/compatchanges/src/com/android/cts/appcompat/CompatChangesValidConfigTest.java
Flag: com.android.media.flags.enable_notifying_activity_manager_with_media_session_status_change
BUG: 399006472,281762171
Change-Id: I92fd3bbfe113f5bed5895f6177d8799741106f74