mb/google/eve: Use keyboard backlight for proof-of-life at boot

This feature was originally present and then dropped, but turns out
that users prefer it. Set the backlight to 50% in romstage, back to
zero in ramstage; skip enabling on the S3 resume path.

TEST=build/boot google/eve, verify keyboard backlight turns on/off
as expected.

Change-Id: I33af888d614010538f69512bbd052ed2b83fcaa5
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76803
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

0 files changed, 0 insertions, 0 deletions