mtd: nand: Introduce nand_data_interface

Currently we have no data structure to fully describe a NAND timing.
We only have struct nand_sdr_timings for NAND timings in SDR mode,
but nothing for DDR mode and also no container to store both types
of timing.
This patch adds struct nand_data_interface which stores the timing
type and a union of different timings. This can be used to pass to
drivers in order to configure the timing.
Add kerneldoc for struct nand_sdr_timings while touching it anyway.

Signed-off-by: Sascha Hauer <[email protected]>
Signed-off-by: Boris Brezillon <[email protected]>

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