layer.conf: Add zeus to compatible layers

zeus is codename for next 3.0 release

Signed-off-by: Khem Raj <raj.khem@gmail.com>

conf/layer.conf

@@ -9,7 +9,7 @@ BBFILE_COLLECTIONS += "raspberrypi"
 BBFILE_PATTERN_raspberrypi := "^${LAYERDIR}/"
 BBFILE_PRIORITY_raspberrypi = "9"
 
-LAYERSERIES_COMPAT_raspberrypi = "sumo thud warrior"
+LAYERSERIES_COMPAT_raspberrypi = "sumo thud warrior zeus"
 
 # Additional license directories.
 LICENSE_PATH += "${LAYERDIR}/files/custom-licenses"