mb/google/hatch: Add keyboard backlight support
This change adds keyboard backlight feature for Hatch platform.
BUG=b:
122799544
BRANCH=none
TEST=keyboard backlight works when EC reports correct info.
Change-Id: I29273122f061e0e442f6629351ef3670535c0507
Signed-off-by: Ivy Jian <ivy_jian@compal.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/31175
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>