hardknott: yocto release

Latest upstream yocto has moved on to the 3.3 hardknott release

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: Ieae36798d66d21c2c642931f06407d3bb2acf163
diff --git a/meta-supermicro/conf/layer.conf b/meta-supermicro/conf/layer.conf
index 23b7406..f46b374 100644
--- a/meta-supermicro/conf/layer.conf
+++ b/meta-supermicro/conf/layer.conf
@@ -7,5 +7,5 @@
 
 BBFILE_COLLECTIONS += "supermicro-layer"
 BBFILE_PATTERN_supermicro-layer := "^${LAYERDIR}/"
-LAYERSERIES_COMPAT_supermicro-layer := "dunfell gatesgarth"
+LAYERSERIES_COMPAT_supermicro-layer := "gatesgarth hardknott"