layer.conf: add LAYERSERIES_COMPAT

Signed-off-by: Wojciech Slenska <wojciech.slenska@gmail.com>
Acked-by: Stefano Babic <sbabic@denx.de>

conf/layer.conf

@@ -9,4 +9,6 @@ BBFILE_COLLECTIONS += "swupdate"
 BBFILE_PATTERN_swupdate := "^${LAYERDIR}/"
 BBFILE_PRIORITY_swupdate = "6"
 
+LAYERSERIES_COMPAT_swupdate = "rocko sumo"
+
 LAYERDEPENDS_swupdate = "openembedded-layer"