Add PACKAGECONFIG for selinux rather than disable it directly. This is
useful for selinux distro feature.
(From OE-Core rev: d25b644741f5b941aa3051545e86e16a365c51c3)
Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>