audio: Clarify "bus" device type am: 467b81d597 am: 4f852b749d

Original change: https://android-review.googlesource.com/c/platform/system/hardware/interfaces/+/2858105

Change-Id: Ic38da7af6f2e702215987750d7a6dacf260e5c02
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>