gpio: loongson-64bit: Add more gpio chip support

The Loongson-7A2000 and Loongson-3A6000 share the same gpio chip model.
Just add them through driver_data.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Acked-by: Huacai Chen <chenhuacai@loongson.cn>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250303074552.3335186-2-zhoubinbin@loongson.cn


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>