meta-phosphor: layer.conf: Add warrior compatibility

oe-core branched in preparation for the upcoming 2.7 Yocto release and
as of 13e45ff requires core layer compatibility to "warrior" instead of
"thud".  We'll retain compatibility for both until we do our own branch
or stop testing thud.

(From meta-phosphor rev: 696da8f0734b47c07e0e5179562c24393df9a26d)

Change-Id: I18eb95b6ae926925c1ac48f5ba0d03b3b88e52b2
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/conf/layer.conf b/meta-phosphor/conf/layer.conf
index c4a3f43..6ffcde0 100644
--- a/meta-phosphor/conf/layer.conf
+++ b/meta-phosphor/conf/layer.conf
@@ -8,7 +8,7 @@
 BBFILE_COLLECTIONS += "phosphor-layer"
 BBFILE_PATTERN_phosphor-layer = "^${LAYERDIR}/"
 LAYERVERSION_phosphor-layer = "1"
-LAYERSERIES_COMPAT_phosphor-layer = "thud"
+LAYERSERIES_COMPAT_phosphor-layer = "thud warrior"
 
 # Provide a variable that points the base of the phosphor layer.
 PHOSPHORBASE = '${@os.path.normpath("${LAYERDIR}/")}'