spi: dt-bindings: mediatek: Set min size for 'mediatek,pad-select'

The minimum array length defaults to the same size as the maximum. For
'mediatek,pad-select', the example has a length of 2 and in-tree .dts
files have a length of 1, but the schema says the length must be 4.

There's currently no warning in the example because the schema fixups
are not handling this case correctly.

Signed-off-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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