MIPS: Octeon: Support 256 MSI on PCIe

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1507/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>