PNOR init workaround for P8 based systems

The PNOR chip requires an init to be done to it prior
to starting the host.  This is a temporary fix to this
issue until we get the mboxd function ported to P8.

Resolves openbmc/openbmc#1426

Change-Id: I784c6aa6ca299fe1d4593295c30d0056f0167706
Signed-off-by: Andrew Geissler <andrewg@us.ibm.com>