meta-aspeed: prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I8135871ae0e3b360aff7d878f7cf04a2504f2dd0
diff --git a/meta-aspeed/conf/layer.conf b/meta-aspeed/conf/layer.conf
index c028975..00302dd 100644
--- a/meta-aspeed/conf/layer.conf
+++ b/meta-aspeed/conf/layer.conf
@@ -6,5 +6,5 @@
 
 BBFILE_COLLECTIONS += "aspeed-layer"
 BBFILE_PATTERN_aspeed-layer := "^${LAYERDIR}/"
-LAYERVERSION_aspeed-layer = "1"
-LAYERSERIES_COMPAT_aspeed-layer = "gatesgarth hardknott"
+LAYERVERSION:aspeed-layer = "1"
+LAYERSERIES_COMPAT_aspeed-layer = "gatesgarth hardknott honister"