[uxlaunxh] Drop the support for uxlaunch type of startup.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>
[systemd] Install systemd service files as a part of build.

Moving the service files from packaging dir to the actual source tree.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>