pinctrl: sunxi: v3s: introduce support for V3

Introduce the GPIO pins that is only available on V3 (not on V3s) to the
V3s pinctrl driver.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>

Link: https://lore.kernel.org/r/20190728031227.49140-2-icenowy@aosc.io
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>