Merge "AudioService: remove DEVICE_OUT_SPDIF from mFixedVolumeDevices" am: ba1f9833fc am: c3bdf24120 am: a3504198a3

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1315084

Change-Id: Ia9f0b49caaffe267773b1115f1a84833e584df1b