busybox-inittab/sysvinit-inittab: add rconflicts
when both installed, do_rootfs report error like:
file /etc/inittab conflicts between attempted installs of
busybox-inittab-1.30.1-r0.qemux86 and sysvinit-inittab-2.88dsf-r10.qemux86
so add each other to rconflicts
Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>