audio: Update ChildInterface to set scheduler policy lazily am: 780fefb331 am: e35c2c8368

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2674338

Change-Id: Ia3d33ab611d4fb766450a5070f6888f6fd127e28
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>