Actually add DimmingStage to client target properties

This change was missed while cherry-picking
I5675c16f0895f9958e3bee3ee4c85df8937ecdb7 due to merge conflicts.
So...actually merge this.

Bug: 218954037
Test: builds
Change-Id: Idb3a518f7dfd4f4fd598672ee709ccd5b1f3f06a