yocto:mickledore: add support for new yocto layer

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I8e54833ac78e540e9dd5011533d53ff9a3af6763
diff --git a/meta-openpower/conf/layer.conf b/meta-openpower/conf/layer.conf
index ef36835..57212b8 100644
--- a/meta-openpower/conf/layer.conf
+++ b/meta-openpower/conf/layer.conf
@@ -9,4 +9,4 @@
 BBFILE_PATTERN_openpower-layer := "^${LAYERDIR}/"
 LAYERVERSION_openpower-layer = "1"
 LAYERDEPENDS_openpower-layer = "core phosphor-layer aspeed-layer"
-LAYERSERIES_COMPAT_openpower-layer = "kirkstone langdale"
+LAYERSERIES_COMPAT_openpower-layer = "langdale mickledore"