Merge "[Media ML] Support customization for volume keys" into rvc-dev am: cd03d90a72 am: ad8ebec2e7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11862405

Change-Id: Ie2f364f5d67093821a12cc71ffe5f9db941f65ce