meta-nuvoton: Add zeus compatibility

oe-core branched in preparation for the upcoming Yocto release.
We'll retain compatibility for warrior until we do our own branch
or stop testing warrior.

Change-Id: I4d351ef5ade6236d2d3af733a0562a08298b339d
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/conf/layer.conf b/conf/layer.conf
index a592301..0ca3258 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -7,4 +7,4 @@
 BBFILE_COLLECTIONS += "nuvoton-layer"
 BBFILE_PATTERN_nuvoton-layer = ""
 LAYERVERSION_nuvoton-layer = "1"
-LAYERSERIES_COMPAT_nuvoton-layer = "thud warrior"
+LAYERSERIES_COMPAT_nuvoton-layer = "warrior zeus"