meta-ingrasys: update Yocto compat for gatesgarth

The next release of Yocto is soon and most of the upstream
layers have switched support strings for it.  Support layer
compat for gatesgarth (current) and dunsfell (previous).

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I459463b368c46ac11fbb14326d3dfc98cdc2991f
diff --git a/conf/layer.conf b/conf/layer.conf
index 5b9d71b..1c9165c 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -3,4 +3,4 @@
 
 BBFILE_COLLECTIONS += "ingrasys"
 BBFILE_PATTERN_ingrasys := "^${LAYERDIR}/"
-LAYERSERIES_COMPAT_ingrasys = "warrior zeus dunfell"
+LAYERSERIES_COMPAT_ingrasys = "dunfell gatesgarth"