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

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

Change-Id: I3ec51f4883999b3c7241f13488dbae900590ebf5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>