mtd: spi-nor: Add support for S3AN spi-nor devices

Xilinx Spartan-3AN FPGAs contain an In-System Flash where they keep
their configuration data and (optionally) some user data.

The protocol of this flash follows most of the spi-nor standard. With
the following differences:

- Page size might not be a power of two.
- The address calculation (default addressing mode).
- The spi nor commands used.

Protocol is described on Xilinx User Guide UG333

Signed-off-by: Ricardo Ribalda Delgado <[email protected]>
Cc: Boris Brezillon <[email protected]>
Cc: Brian Norris <[email protected]>
Cc: Marek Vasut <[email protected]>
Reviewed-by: Marek Vasut <[email protected]>
Signed-off-by: Cyrille Pitchen <[email protected]>

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