util-linux: rename bbappend to match new version from oe-core

* removed PRINC to make it easier to remove .bbappend if this
  functionality is moved to oe-core

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
systemd: rename bbappend to match new version from oe-core

* removed PRINC to make it easier to remove .bbappend if this
  functionality is moved to oe-core

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
connman: rename bbappend to match new version from oe-core

* removed PRINC to make it easier to remove .bbappend if this
  functionality is moved to oe-core
* removed SYSTEMD_SERVICE already set in oe-core's .inc file

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>