de.pengutronix.rauc.Installer.xml: add doctype to dbus xml specification
de.pengutronix.rauc.Installer.xml: add doctype to dbus xml specification

Signed-off-by: Morgan Bengtsson <a5a1084d111def5899d5e5937ea48ffb21ad9a5b@kdab.com>

rauc/rauc,jluebbe/rauc,jluebbe/rauc,ejoerns/rauc,jluebbe/rauc,rauc/rauc,ejoerns/rauc,ejoerns/rauc,rauc/rauc