sys-apps/fwupd: Trigger fwupdtool update on boot

Adds a new script to be run by /etc/init/boot-update-firmware.conf to
install any pending firmware updates available in the system.

BUG=b:167681094
TEST=emerge-sarien fwupd; reboot with a pending update

Cq-Depend: chromium:2405305
Change-Id: I05a9bc6521bd6d4f7de79f85420edd71a3e34167
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2391971
Reviewed-by: Benson Leung <bleung@google.com>
Tested-by: Daniel Campello <campello@chromium.org>
Commit-Queue: Daniel Campello <campello@chromium.org>
Auto-Submit: Daniel Campello <campello@chromium.org>
3 files changed