Allow using config files to pass reboot parameters to systemd
Allow using config files to pass reboot parameters to systemd

DSME assumes that invoking systemd shutdown target while usb cable
is connected results in reboot due to charger connection and the device
lands in act dead mode. For some devices it does not work like this and
systemd reboot with special kernel parameters should be made.

Allow using configuration files to select reboot instead of shutdown
when dsme makes switch to act dead mode and define reboot parameters
systemd should use when reboot target is reached.

[dsme] Allow using config files to pass reboot parameters to systemd. Contributes to JB#27085

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