[VTS] Update SetDisplayBrightness test item am: 70d2ef6b34 am: 5799726c7c am: 782aae68ab

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2883951

Change-Id: Id727befaf378377406258d3ffe88b2847338df59
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>