Merge "CEC: Add listener for HDMI CEC volume control feature" into rvc-dev am: 75ef06daa5 am: 1ce1702e90

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11246196

Change-Id: Ib7b1210ad32092e4d8a22a3143270d82cdf680c4