* use systemd class to auto-enable installed services
* make sure lc15-sysdev-remap is started before lc15bts-mgr
* keep BTS-specific name to enable adjustment via service file template
in future versions
Note: the script is imported as-is, but .bb file is modified because we
use .service file from previous patch instead of init file. I'm not
familiar enough with bitbake to be sure that the changes are correct so
I'd appreciate thorough review.