MIPS: Octeon: Clean up platform code.

Remove unused headers and fix warnings from checkpatch.

Signed-off-by: Steven J. Hill <Steven.Hill@cavium.com>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15407/


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