Merge tag 'android-10.0.0_r31' into lineage-17.1-android-10.0.0_r31

Android 10.0.0 release 31

* tag 'android-10.0.0_r31':
  audio: free and assign NULL to global static device pointer
  post_proc: release vol listener object based on context
  audio: free and assign NULL to global static device pointer

Change-Id: Ie4f5f97dcba429e6133f8c1c4c6b3538d1a9c8d3