This enables the keyboard backlight feature in ACPI for madoo.
BUG=b:167943993
TEST=Verified 'kbd_backlight' shows up in the '/sys/class/leds '.
Signed-off-by: Ian Feng <ian_feng@compal.corp-partner.google.com>
Change-Id: I11531699cb650b96becae5c1bec9f89c48b6bea0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45330
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>