interrupt-mapping: Fix parent interrupt specifier description
interrupt-mapping: Fix parent interrupt specifier description

The number of cells here is not dictated by the #interrupt-cells
property of this node, but the same property in the interrupt
parent. This looks like a copy/paste mistake from child interrupt
specifier.

Signed-off-by: Stephen Boyd <6d664ab3dfbd5458b87a27f8fa9cdab38739b6b8@linaro.org>
Signed-off-by: Rob Herring <fbb37eacae100e13076d5c4b46f06cfa4d6fa9f8@kernel.org>

devicetree-org/devicetree-specification