MIPS: Octeon: Update PCI Latency timer, PCIe payload, and PCIe max read to allow...

MIPS: Octeon: Update PCI Latency timer, PCIe payload, and PCIe max read to allow larger transactions

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2987/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>