meta-lenovo: 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).

(From meta-lenovo rev: 7cb057d597100ce7f6483f487a3b6c4ebe10b30f)

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Iecf217b8ab2ba47e8f741f8792e6b32fdfa7332d
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-lenovo/meta-hr630/conf/layer.conf b/meta-lenovo/meta-hr630/conf/layer.conf
index 2cec8b5..58bf526 100644
--- a/meta-lenovo/meta-hr630/conf/layer.conf
+++ b/meta-lenovo/meta-hr630/conf/layer.conf
@@ -11,4 +11,4 @@
 BBFILE_COLLECTIONS += "hr630-layer"
 BBFILE_PATTERN_hr630-layer = ""
 BBFILE_PRIORITY_hr630-layer = "5"
-LAYERSERIES_COMPAT_hr630-layer = "thud warrior"
+LAYERSERIES_COMPAT_hr630-layer = "dunfell gatesgarth"