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.

(From meta-nuvoton rev: 9c1bea0138db3b204cb143d3471a592f06d91009)

Change-Id: I7d397bf715cd77aa708f0ffac0605dcac44c06de
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-nuvoton/conf/layer.conf b/meta-nuvoton/conf/layer.conf
index a592301..0ca3258 100644
--- a/meta-nuvoton/conf/layer.conf
+++ b/meta-nuvoton/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"