add langdale to compatible layer

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I65febeeec11e6e5b40ee728f42cfbe77023dae1e
diff --git a/meta-wistron/conf/layer.conf b/meta-wistron/conf/layer.conf
index 4538fcf..f62cf1b 100644
--- a/meta-wistron/conf/layer.conf
+++ b/meta-wistron/conf/layer.conf
@@ -7,4 +7,4 @@
 
 BBFILE_COLLECTIONS += "wistron-layer"
 BBFILE_PATTERN_wistron-layer := "^${LAYERDIR}/"
-LAYERSERIES_COMPAT_wistron-layer = "honister kirkstone"
+LAYERSERIES_COMPAT_wistron-layer = "kirkstone langdale"