ARM: dts: sun9i: Add missing #interrupt-cells to R_PIO pinctrl device node

The R_PIO device node is missing #interrupt-cells, which causes
interrupt parsing to fail to match it as a valid interrupt controller.

Add #interrupt-cells to it. Also remove the unnecesary #address-cells
and #size-cells.

Fixes: 1ac56a6d

 ("ARM: dts: sun9i: Add A80 R_PIO pin controller device
		      node")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>