meta-google: layer.conf: add zeus compatibility

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

(From meta-google rev: 3bc085b11bb53063d63b043a9d678cfd4359eacd)

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Ia05fbd051ec17edd30849480fbeb94c263f96935
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-google/conf/layer.conf b/meta-google/conf/layer.conf
index bec624e..982339c 100644
--- a/meta-google/conf/layer.conf
+++ b/meta-google/conf/layer.conf
@@ -7,4 +7,4 @@
 BBFILE_COLLECTIONS += "google-layer"
 BBFILE_PATTERN_google-layer := "^${LAYERDIR}/"
 LAYERVERSION_google-layer = "1"
-LAYERSERIES_COMPAT_google-layer = "thud warrior"
+LAYERSERIES_COMPAT_google-layer = "warrior zeus"