Make PROPERTY_SYSTEM_AUDIO_MODE_MUTING_ENABLE read-only.

This property was manually set to false in LocalDevice before.
Adding false value in atom.mk and make the property read-only now.

ag/4947274

Test: local tested.
Bug: 80297700
Change-Id: Ibf9890233b111653b340c381d86639da1086d9a0
2 files changed