meta-facebook: more prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I21120d6215c25be49afd60d6e807b68f2798423a
diff --git a/meta-facebook/meta-bletchley/conf/layer.conf b/meta-facebook/meta-bletchley/conf/layer.conf
index 51e1cab..8e27709 100644
--- a/meta-facebook/meta-bletchley/conf/layer.conf
+++ b/meta-facebook/meta-bletchley/conf/layer.conf
@@ -6,6 +6,6 @@
             ${LAYERDIR}/recipes-*/*/*.bbappend"
 
 BBFILE_COLLECTIONS += "bletchley-layer"
-BBFILE_PATTERN:bletchley-layer := "^${LAYERDIR}/"
+BBFILE_PATTERN_bletchley-layer := "^${LAYERDIR}/"
 
-LAYERSERIES_COMPAT:bletchley-layer := "gatesgarth hardknott"
+LAYERSERIES_COMPAT_bletchley-layer := "gatesgarth hardknott honister"