pinctrl: Ingenic: Add pinctrl driver for JZ4760 and JZ4760B.

Add support for probing the pinctrl-ingenic driver on the
JZ4760 Soc and the JZ4760B Soc from Ingenic.

Signed-off-by: Zhou Yanjie <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>

Author: XBurst