coreutils: fix problem with acl for 6.9 version

coreutils: fix problem with acl for 6.9 version

If 'acl' is not in DISTRO_FEATURES, building coreutils 6.9 would sometimes
fail. The problem could be reproduced by executing the following command.

`bitbake acl && bitbake coreutils -c configure && bitbake acl -c cleansstate
&& bitbake coreutils -c compile'

Fix this problem by setting the correct value for the 'acl' PACKAGECONFIG.

[YOCTO #8906]

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>