pinctrl: freescale: Add i.MX8MP pinctrl driver support

Add the pinctrl driver support for i.MX8MP.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Link: https://lore.kernel.org/r/1579052348-32167-2-git-send-email-Anson.Huang@nxp.com


Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>