layer.conf: add mickledore to LAYERSERIES_COMPAT

Signed-off-by: Geoff Parker <geoffrey.parker@arthrex.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>

conf/layer.conf

@@ -9,6 +9,6 @@ BBFILE_COLLECTIONS += "swupdate"
 BBFILE_PATTERN_swupdate := "^${LAYERDIR}/"
 BBFILE_PRIORITY_swupdate = "6"
 
-LAYERSERIES_COMPAT_swupdate = "dunfell kirkstone langdale"
+LAYERSERIES_COMPAT_swupdate = "dunfell kirkstone langdale mickledore"
 
 LAYERDEPENDS_swupdate = "openembedded-layer"