meta-aspeed: layer.conf: add zeus compatibility

OE-core master will be dropping warrior soon; zeus is the next release.

Change-Id: I916341014bc037059597f73ea9e219dbbd48f3a1
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/conf/layer.conf b/conf/layer.conf
index 55ec1c8..9741d26 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -7,4 +7,4 @@
 BBFILE_COLLECTIONS += "aspeed-layer"
 BBFILE_PATTERN_aspeed-layer := "^${LAYERDIR}/"
 LAYERVERSION_aspeed-layer = "1"
-LAYERSERIES_COMPAT_aspeed-layer = "warrior"
+LAYERSERIES_COMPAT_aspeed-layer = "warrior zeus"