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

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

Change-Id: Iea74b20aecffaab88881bbcb43a6c46b91aed33c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>