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

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

Change-Id: I2314b5dd09df823a203088c16481fa8717cae5df