Merge "SCREEN_BRIGHTNESS - map 255 to current max" into sc-dev am: e4e836a175 am: 379e94d1da am: 58622a42ef

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15359296

Change-Id: I9d8386e0dbf5de0cfeedc0244bd5ddbdfddf8f15