MIPS: Octeon: Select ZONE_DMA32

Give us a nice place to allocate coherent DMA memory for 32-bit devices.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1635/


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