m86k: convert gpio driver to use gpio_chip_ops

The GPIO controller operations has been split to be stored
on a separate struct gpio_chip_ops virtual function table.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
MIPS: Alchemy: convert gpio driver to use gpio_chip_ops

The GPIO controller operations has been split to be stored
on a separate struct gpio_chip_ops virtual function table.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>