pinctrl: Ingenic: Add pinctrl driver for X2100.

Add support for probing the pinctrl-ingenic driver on the
X2100 SoC from Ingenic.
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
Link: https://lore.kernel.org/r/1627108604-91304-5-git-send-email-zhouyanjie@wanyeetech.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>