meta-quanta: 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-quanta rev: 2f44b654638974a96365ba358f8991688682d8e9)

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I1f2ef645a1d05a7a8d3c2f1c7e8ec1bdecfd33ff
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-quanta/conf/layer.conf b/meta-quanta/conf/layer.conf
index 18308e7..8db4bd2 100644
--- a/meta-quanta/conf/layer.conf
+++ b/meta-quanta/conf/layer.conf
@@ -7,4 +7,4 @@
 
 BBFILE_COLLECTIONS += "quanta-layer"
 BBFILE_PATTERN_quanta-layer := "^${LAYERDIR}/"
-LAYERSERIES_COMPAT_quanta-layer = "warrior zeus dunfell"
+LAYERSERIES_COMPAT_quanta-layer = "dunfell gatesgarth"