Merge "Assert the errors size to 1 for case SetDisplayBrightness" into main am: 9e65f0a00d am: 2647200f4c

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3174319

Change-Id: I74c2be26ae1cc26ace79e6a603a7c2bf936410e5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>