meta-facebook: more prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I21120d6215c25be49afd60d6e807b68f2798423a
diff --git a/meta-facebook/conf/layer.conf b/meta-facebook/conf/layer.conf
index a22a085..895d48f 100644
--- a/meta-facebook/conf/layer.conf
+++ b/meta-facebook/conf/layer.conf
@@ -6,5 +6,5 @@
             ${LAYERDIR}/recipes-*/*/*.bbappend"
 
 BBFILE_COLLECTIONS += "facebook-layer"
-BBFILE_PATTERN:facebook-layer := "^${LAYERDIR}/"
-LAYERSERIES_COMPAT:facebook-layer := "gatesgarth hardknott"
+BBFILE_PATTERN_facebook-layer := "^${LAYERDIR}/"
+LAYERSERIES_COMPAT_facebook-layer := "gatesgarth hardknott honister"