Merge "Making mirror slider appear when brightness slider is used in split...

Merge "Making mirror slider appear when brightness slider is used in split shade" into sc-v2-dev am: 21cb5e5b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15328600

Change-Id: I94679539cc5fef0ed56220d27b34f4d8da321751