meta-bytedance: 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-bytedance rev: dd8a65df2ed78f90c119e4cb1f388f46f2d586e2)

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I96fc7c6313aad49530f87f3c7b93840a31fe3478
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-bytedance/conf/layer.conf b/meta-bytedance/conf/layer.conf
index 6fa8da7..1f36655 100644
--- a/meta-bytedance/conf/layer.conf
+++ b/meta-bytedance/conf/layer.conf
@@ -7,4 +7,4 @@
 
 BBFILE_COLLECTIONS += "bytedance-layer"
 BBFILE_PATTERN_bytedance-layer = "^${LAYERDIR}/"
-LAYERSERIES_COMPAT_bytedance-layer = "dunfell"
+LAYERSERIES_COMPAT_bytedance-layer = "dunfell gatesgarth"