meta-nuvoton: dunfell: add support for new layer

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I80718aacac350e54536965f92367bc5c0032ec76
diff --git a/conf/layer.conf b/conf/layer.conf
index 0ca3258..19af7e9 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -7,4 +7,4 @@
 BBFILE_COLLECTIONS += "nuvoton-layer"
 BBFILE_PATTERN_nuvoton-layer = ""
 LAYERVERSION_nuvoton-layer = "1"
-LAYERSERIES_COMPAT_nuvoton-layer = "warrior zeus"
+LAYERSERIES_COMPAT_nuvoton-layer = "warrior zeus dunfell"