intelblocks/pep: Add display on/off notifications

Add display on and off notifications which call mainboard hooks if
present. This allows to handle some board specific functions in user
absence or presence (when display goes off from inactivity or on from
activity).

TEST=Use Display on/off notification on Clevo NV41 to tell EC about
laptop inactivity. It is necessary to properly handle S0ix entry (stop
the fans and start blinking the power led).

Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Signed-off-by: Michał Kopeć <michal.kopec@3mdeb.com>
Change-Id: Ie80f631ecffa74467ab6d6162e552ba977f7e3f4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62494
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

0 files changed, 0 insertions, 0 deletions