pinctrl: imx8ulp: Add pinctrl driver support

Add i.MX8ULP pinctrl driver support.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Link: https://lore.kernel.org/r/20210607061041.2654568-2-ping.bai@nxp.com


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