[SCSI] ipr: define new offsets to registers for the next generation chip

This patch adds the entry to the ipr_chip_cfg array that defines the register
offsets for the next generation 64 bit IOA PCI interface chip.

Signed-off-by: Wayne Boyer <wayneb@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>