ARM: dts: sun8i: a33: Reintroduce default pinctrl muxing

Commit d0275214 ("ARM: dts: sun8i-a23-a33: Move NAND controller device
node to sort by address") moved the NAND controller node around, but
dropped the default muxing in the process.

Reintroduce it.

Fixes: d0275214 ("ARM: dts: sun8i-a23-a33: Move NAND controller device node to sort by address")
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>