phosphor: set layer compatibility to thud

Change-Id: I9ac40d0ff7f6091120856e6b51d47853bd20da3b
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/conf/layer.conf b/conf/layer.conf
index 3f2cf39..c4a3f43 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -8,7 +8,7 @@
 BBFILE_COLLECTIONS += "phosphor-layer"
 BBFILE_PATTERN_phosphor-layer = "^${LAYERDIR}/"
 LAYERVERSION_phosphor-layer = "1"
-LAYERSERIES_COMPAT_phosphor-layer = "sumo"
+LAYERSERIES_COMPAT_phosphor-layer = "thud"
 
 # Provide a variable that points the base of the phosphor layer.
 PHOSPHORBASE = '${@os.path.normpath("${LAYERDIR}/")}'