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

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

Change-Id: I3a8dc8651c1b272288ee1bf4eb203ba215ee94ce
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>