Add sysprop to enable ALS controlled keyboard backlight am: c71cf72bc5

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/libsysprop/+/23434004

Change-Id: I446eddfa2a41d5c51b270cf877a286de44878524
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: 3c1e3ce7d20299f7244ca997ce442f7ed328093a
  1. srcs/
  2. CAR_OWNERS
  3. OWNERS