[tplino-core] Fix systemd's CONFFILES
[tplino-core] Fix systemd's CONFFILES

https://REVIEWSERVER/D1920 overwrote systemd's CONFFILES variable instead of appending
to it.
Fixes https://ISSUESERVER/issues/3725

	modified:   recipes-core/systemd/systemd_216.bbappend

wfailla/meta-caros,carosio/meta-caros,pokymobo/meta-caros,umatomba/meta-caros,thz/meta-caros,GalaxyGorilla/meta-caros,RoadRunnr/meta-caros,wfailla/meta-caros,RoadRunnr/meta-caros,tlnd/meta-caros,wfailla/meta-caros,pokymobo/meta-caros,thz/meta-caros,hsychla/meta-caros,wfailla/meta-caros,thz/meta-caros,RoadRunnr/meta-caros,hsychla/meta-caros,hsychla/meta-caros,pokymobo/meta-caros,ContentSafe/meta-caros,GalaxyGorilla/meta-caros,tlnd/meta-caros,ContentSafe/meta-caros,umatomba/meta-caros,RoadRunnr/meta-caros,carosio/meta-caros,carosio/meta-caros,pokymobo/meta-caros,GalaxyGorilla/meta-caros,hsychla/meta-caros,pokymobo/meta-caros,tlnd/meta-caros,GalaxyGorilla/meta-caros,ContentSafe/meta-caros,thz/meta-caros,umatomba/meta-caros,umatomba/meta-caros,hsychla/meta-caros,ContentSafe/meta-caros,thz/meta-caros,carosio/meta-caros,pokymobo/meta-caros,ContentSafe/meta-caros,GalaxyGorilla/meta-caros,tlnd/meta-caros,ContentSafe/meta-caros,wfailla/meta-caros,RoadRunnr/meta-caros,umatomba/meta-caros,tlnd/meta-caros,carosio/meta-caros