treewide: support yocto kirkstone release

* Deprecate N-1 release (hardknott).
* Enable N+1 release (kirkstone).

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I39e027e02dab64b4390b46ffbd9c299c858f403e
diff --git a/meta-evb/meta-evb-aspeed/meta-evb-ast2600/conf/layer.conf b/meta-evb/meta-evb-aspeed/meta-evb-ast2600/conf/layer.conf
index 277e712..359b479 100644
--- a/meta-evb/meta-evb-aspeed/meta-evb-ast2600/conf/layer.conf
+++ b/meta-evb/meta-evb-aspeed/meta-evb-ast2600/conf/layer.conf
@@ -8,4 +8,4 @@
 BBFILE_COLLECTIONS += "meta-evb-ast2600"
 BBFILE_PATTERN_meta-evb-ast2600 = "^${LAYERDIR}/"
 
-LAYERSERIES_COMPAT_meta-evb-ast2600 = "hardknott honister"
+LAYERSERIES_COMPAT_meta-evb-ast2600 = "honister kirkstone"