MIPS: octeon: Use of_address_to_resource()

Replace of_get_address() and of_translate_address() calls with single
call to of_address_to_resource().

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>