add langdale to compatible layer

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I65febeeec11e6e5b40ee728f42cfbe77023dae1e
diff --git a/meta-ibm/meta-palmetto/conf/layer.conf b/meta-ibm/meta-palmetto/conf/layer.conf
index a9050c4..f03e22d 100644
--- a/meta-ibm/meta-palmetto/conf/layer.conf
+++ b/meta-ibm/meta-palmetto/conf/layer.conf
@@ -7,4 +7,4 @@
 
 BBFILE_COLLECTIONS += "palmetto-layer"
 BBFILE_PATTERN_palmetto-layer := "^${LAYERDIR}/"
-LAYERSERIES_COMPAT_palmetto-layer = "honister kirkstone"
+LAYERSERIES_COMPAT_palmetto-layer = "kirkstone langdale"