phosphor-software-manager: Create bbappend to specify ubi locations

Each system can specify the locations where the images should be
stored during a bmc code update. Create one for witherspoon.

Resolves openbmc/openbmc#1758

Change-Id: Ib024554b97d01c9783219e224eed0d12f6b4574f
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
1 file changed