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).

(From meta-ingrasys rev: 52368129e9b624f9acd98c6156ea7a5d6d21ba4f)

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: If78b0ef8b9db95b8af2254d4b299a6c28e262044
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-ingrasys/conf/layer.conf b/meta-ingrasys/conf/layer.conf
index 5b9d71b..1c9165c 100644
--- a/meta-ingrasys/conf/layer.conf
+++ b/meta-ingrasys/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"