Add PACKAGECONFIG for 'audit', otherwise there would be warnings like
below which would possibly lead to do_rootfs failure.
WARNING: QA Issue: systemd-analyze rdepends on audit, but it isn't a build dependency? [build-deps]
WARNING: QA Issue: systemd rdepends on audit, but it isn't a build dependency? [build-deps]
Signed-off-by: Chen Qi <Qi.Chen@windriver.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
