[automerger skipped] audio: Use ChildInterface in StreamCommonImpl am: 291712fd -s ours

am skip reason: Merged-In I1350e7b3720c6244cd8527e1d021ee9577399291 with SHA-1 2eabaf99 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/24287964



Change-Id: I0cfd2422489903b2250b0c3056e015b48e72f721
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>