spi: dt-bindings: mediatek,spi-mtk-nor: Fix example 'interrupts' property

A phandle for 'interrupts' value is wrong and should be one or more numbers.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220106182518.1435497-9-robh@kernel.org


Signed-off-by: Mark Brown <broonie@kernel.org>