Improve Loongson-2's GPIO driver to support Loongson-3A/3B, and update
Loongson-3's default config file.
Acked-by: NRalf Baechle <ralf@linux-mips.org>
Signed-off-by: NHuacai Chen <chenhc@lemote.com>
Reviewed-by: NAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>