flashchips: Fix W25Q256.W

The JW is the only known variant. A W25Q256FW may have existed with
less 4BA instructions supported, but it never showed up and no data-
sheet is available.

Used the datasheet from here:
https://www.winbond.com/resource-files/w25q256jw%20spi%20revb%2012082017.pdf

Change-Id: I9a3995c66ad7b74823e17984bf1ffac50b5663e0
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Nico Huber <nico.h@gmx.de>
Ticket: https://ticket.coreboot.org/issues/362
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/44810
Original-Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/70984
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed