witherspoon-128: Add witherspoon MACHINEOVERRIDES

The witherspoon and witherspoon-128 machines are mostly the same.
Add "witherspoon" as a MACHINEOVERRIDES to witherspoon-128 so that
machine-specific features that apply only to witherspoon, including
file paths, can be added to both flavors of witherspoon automatically.

Tested: Built witherspoon and witherspoon-128, flashed images on
        HW and verified witherspoon powered on.

Change-Id: Ic6bd7f5a8045688d0d89957d10dd4a3234cba29f
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
1 file changed