dt-bindings: pinctrl: sunxi: Make interrupts optional

The R_PIO pinctrl device on the Allwinner H616 SoC does not have an
interrupt (it features only two pins).
However the binding requires at least naming one upstream interrupt,
plus the #interrupt-cells and interrupt-controller properties.

Drop the unconditional requirement for the interrupt properties, and
make them dependent on being not this particular pinctrl device.

Signed-off-by: Andre Przywara <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Acked-by: Samuel Holland <[email protected]>
Signed-off-by: Jernej Skrabec <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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