distro/poky: Set EXTRAOPKGCONFIG

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

meta/conf/distro/poky.conf

@@ -113,5 +113,7 @@ DISTRO_EXTRA_RRECOMMENDS += "kernel-module-af-packet"
 
 IMAGE_FEATURES ?= ""
 
+EXTRAOPKGCONFIG = "poky-feed-config-opkg"
+
 require conf/distro/include/world-broken.inc