pinctrl: Ingenic: Add missing pins to the JZ4770 MAC MII group.

The MII group of JZ4770's MAC should have 7 pins, add missing
pins to the MII group.

Fixes: 5de1a73e ("Pinctrl: Ingenic: Add missing parts for JZ4770 and JZ4780.")
Cc: <stable@vger.kernel.org>
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/1618757073-1724-2-git-send-email-zhouyanjie@wanyeetech.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>