m25p80: Add the n25q256a SFDP table

The same values were collected on 4 differents OpenPower systems,
palmettos, romulus and tacoma.

The SFDP table size is defined as being 0x10

m25p80: Add the n25q256a SFDP table

The same values were collected on 4 differents OpenPower systems,
palmettos, romulus and tacoma.

The SFDP table size is defined as being 0x100 bytes but it could be
bigger. Only the mandatory table for basic features is available at
byte 0x30.

Signed-off-by: Cédric Le Goater <clg@kaod.org>

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