Accton AS6700_32X: Add to support the r01c machine

The ``r01c`` machine uses another SPI flash and new partition table.
Current ``r0`` ONIE is no longer compatible with the new machine.
The patch will separate the ONIE into ``r0`` and ``r1``.  The ``r1``
ONIE is suitable for the ``r01c`` machine.

Signed-off-by: Curt Brune <curt@cumulusnetworks.com>