[systemd] Use systemctl commands for shutdown/reboot
[systemd] Use systemctl commands for shutdown/reboot

Signed-off-by: Pekka Lundstrom <948d1315824207dbb061e7504bc7adb5755c47ce@jollamobile.com>

philippedeswert/dsme,philippedeswert/dsme,philippedeswert/dsme,spiiroin/dsme,spiiroin/dsme