Merge "Revert "SCREEN_BRIGHTNESS - map 255 to current max"" into sc-dev am: d5e1458566 am: 070300e858 am: 7a810b6914

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

Change-Id: I6b82fa3b1e14cd3dac25a4b05ed933383f24e2ff