GenWQE: Enable access to VPD flash area

In addition to the two flash partitions we used so far, there is a 3rd
one which is enabled for usage by this fix.

Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>