dunfell: add support for new layer

(From meta-phosphor rev: de7df6ae69414c3168d968dccca08d10d10418b7)

Change-Id: Ie1c39397ef6729ef96c4378029646a6d2dac9532
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-phosphor/conf/layer.conf b/meta-phosphor/conf/layer.conf
index d352306..028c6e5 100644
--- a/meta-phosphor/conf/layer.conf
+++ b/meta-phosphor/conf/layer.conf
@@ -8,7 +8,7 @@
 BBFILE_COLLECTIONS += "phosphor-layer"
 BBFILE_PATTERN_phosphor-layer := "^${LAYERDIR}/"
 LAYERVERSION_phosphor-layer = "1"
-LAYERSERIES_COMPAT_phosphor-layer = "warrior zeus"
+LAYERSERIES_COMPAT_phosphor-layer = "warrior zeus dunfell"
 
 IMAGE_FEATURES[validitems] += "tools-profile"