Now that avahi has a dbus PACKAGECONFIG we need to ensure it's enabled as
otherwise the avahi-ui module won't build.
(From OE-Core rev: d5e3cf611d302babf0120f887f15aec176ff3429)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>