pinctrl: Ingenic: Add pinctrl driver for X2000.

Add support for probing the pinctrl-ingenic driver on the
X2000 SoC from Ingenic.

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/1618757073-1724-13-git-send-email-zhouyanjie@wanyeetech.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>