UPSTREAM: google/auron: Fix omitted ACPI KB backlight for variants

Restores KB backlight functionality for auron variants
gandof, lulu, and samus.

TEST: boot Lulu and observe KB backlight functional

BUG=None
BRANCH=None
TEST=None

Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/17960
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

Change-Id: Iaa852f9327ff1690111db610b4cc5266cd7925b4
Reviewed-on: https://chromium-review.googlesource.com/425293
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
6 files changed