systemd: set INHIBIT_UPDATERCD_BBCLASS without sysvinit in features
* fixes udev configure in run-postinsts failing with:
update-rc.d: /etc/init.d/systemd-udev: file does not exist
because systemd-udev is installed only with sysvinit in features
but update-rc.d was always called from PN postinst
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>