Revert "Revert "Making mirror slider appear when brightness slider is used in split shade""

This reverts commit 7b43d589765a595a47df7ba8b0cc523cdc893118.

Reason for revert: Submitting code with problem fixed
Test: CTS in Forrest
Bug: 193651759

Change-Id: I8dd921ab34798ac156af17a14e2ca27c70a743cc
11 files changed