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 dunfell (previous).

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I0b0fc4695479578378b45c0c601c45bf2e07b254
diff --git a/meta-olympus-nuvoton/conf/layer.conf b/meta-olympus-nuvoton/conf/layer.conf
index 28eb35f..6d8da09 100644
--- a/meta-olympus-nuvoton/conf/layer.conf
+++ b/meta-olympus-nuvoton/conf/layer.conf
@@ -7,4 +7,4 @@
 
 BBFILE_COLLECTIONS += "olympus-nuvoton-layer"
 BBFILE_PATTERN_olympus-nuvoton-layer := "^${LAYERDIR}/"
-LAYERSERIES_COMPAT_olympus-nuvoton-layer = "warrior zeus dunfell"
+LAYERSERIES_COMPAT_olympus-nuvoton-layer = "dunfell gatesgarth"