MIPS: Octeon: Convert CIU types to use bitfields.

Convert remaining structures to use __BITFIELD_FIELD macro. Also
straighten up the description text and whitespace.

Signed-off-by: Steven J. Hill <steven.hill@cavium.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19709/
Cc: linux-mips@linux-mips.org
Cc: Chandrakala Chavva <cchavva@caviumnetworks.com>