systemd: Remove items that made this machine (qemu) specific

systemd: Remove items that made this machine (qemu) specific

Create a new systemd-conf recipe to contain the specific system/machine
configuration items.  This new package is now machine specific.

Without doing this trying to create a single system with multiple BSPs,
one of which was qemu based, would result in the systemd -and- everything that
dependend upon systemd to have their hash changed.  The hash changing means
lots of rebuilds, but worse if it's a package based system each different
machine ends with a new PR value and a newly generated package.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>