dt-binding: mtd: nand: Document the cs-gpios property

To reach higher capacities, arrays of chips are now pretty common.
Unfortunately, most of the controllers have been designed a decade ago
and did not all anticipate the need for several chip-selects. The new
cs-gpios property allows to workaround this limitation by adding as many
GPIO chip-select as needed.

Signed-off-by: Miquel Raynal <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/linux-mtd/[email protected]

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