Fix LAYERSERIES_COMPAT warning for meta-intel.

Add LAYERSERIES_COMPAT_xx lines in layer.conf to specify
OpenEmbedded-Core version that we are compatible with.

Change-Id: Ia5f4569d6997742e2b0205b6eb8e850498f6895e
Signed-off-by: Jia, Chunhui <chunhui.jia@linux.intel.com>
diff --git a/meta-s2600wf/conf/layer.conf b/meta-s2600wf/conf/layer.conf
index 75954f6..8f0281e 100644
--- a/meta-s2600wf/conf/layer.conf
+++ b/meta-s2600wf/conf/layer.conf
@@ -8,3 +8,4 @@
 BBFILE_COLLECTIONS += "s2600wf"
 BBFILE_PATTERN_s2600wf = ""
 BBFILE_PRIORITY_s2600wf = "5"
+LAYERSERIES_COMPAT_s2600wf = "sumo"