MIPS: Octeon: Remove unnecessary MODULE_*()

octeon-platform.c can not be built as a module for two reasons:

(a) the Makefile doesn't allow it:
    obj-y := cpu.o setup.o octeon-platform.o octeon-irq.o csrc-octeon.o

(b) the multiple *_initcall() statements, each of which are translated
    to a module_init() call when attempting a module build, become
    aliases to init_module().  Having more than one alias will cause a
    build error.

Hence, rather than adding a linux/module.h include, remove the redundant
MODULE_*() from this file.

Acked-by: David Daney <david.daney@cavium.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>