Inventory: Make changes for sync inventory for witherspoon

Add the environment file for witherspoon

Resolves openbmc/openbmc#2361

Change-Id: Id2aabb9e4c484e081f38f1afb33157e64a8453dd
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>
diff --git a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/obmc-mgr-inventory%/obmc/sync_inventory_item/system/chassis/motherboard/bmc/ethernet b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/obmc-mgr-inventory%/obmc/sync_inventory_item/system/chassis/motherboard/bmc/ethernet
new file mode 100644
index 0000000..722e0e6
--- /dev/null
+++ b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/recipes-phosphor/chassis/obmc-mgr-inventory%/obmc/sync_inventory_item/system/chassis/motherboard/bmc/ethernet
@@ -0,0 +1,2 @@
+PROPERTY="MACAddress"
+SYNC_TYPE=mac