meta-witherspoon: Remove vddr voltage override

The VDDR overrides were only appropriate for chip before DD1.02.
Those older chips have all been removed from lab circulation.

Resolves openbmc/openbmc#1285.

Change-Id: Ie5d6efe6cadaa1f6938741d4932f79d5130afaf0
Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
1 file changed