Merge "Revert "SCREEN_BRIGHTNESS - map 255 to current max"" into sc-dev am: d5e1458566 am: 070300e858

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15404418

Change-Id: I6a7bb364f5453e557a262037ab930ec007c1ee44