systemd: Add sch-fq-codel to RRECOMMENDS

systemd sets net.core.default_qdisc = fq_codel, include
kernel-module-sch-fq-codel in RRECOMMENDS to satify this

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>