nuvoton: Set LAYERSERIES_COMPAT

Bitbake warns when this variable is not set for a layer. Set it in the
Nuvoton BSP and EVB layers to indicate sumo branch compatiblity.

Change-Id: If2dd63954ca88d0dc4e0427eb6c3ccf035681585
Signed-off-by: Benjamin Fair <benjaminfair@google.com>
diff --git a/meta-openbmc-machines/meta-evb/meta-evb-nuvoton/conf/layer.conf b/meta-openbmc-machines/meta-evb/meta-evb-nuvoton/conf/layer.conf
index 924e3a7..5a8db75 100644
--- a/meta-openbmc-machines/meta-evb/meta-evb-nuvoton/conf/layer.conf
+++ b/meta-openbmc-machines/meta-evb/meta-evb-nuvoton/conf/layer.conf
@@ -3,3 +3,4 @@
 
 BBFILE_COLLECTIONS += "evb-nuvoton"
 BBFILE_PATTERN_evb-nuvoton = ""
+LAYERSERIES_COMPAT_evb-nuvoton = "sumo"