pinctrl: Ingenic: Add pinctrl driver for X1000 and X1000E.

Add support for probing the pinctrl-ingenic driver on the
X1000 Soc and the X1000E Soc from Ingenic.
Signed-off-by: Zhou Yanjie <zhouyanjie@zoho.com>
Link: https://lore.kernel.org/r/1563076436-5338-5-git-send-email-zhouyanjie@zoho.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>