audio: Refactor streams implementation am: d5554cfae2

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2639436

Change-Id: I57e2f9402e67565a6373e1349b177189f09a8c2b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>