mtd: spi-nor: Add Winbond w25q32jv support

Datasheet:
https://www.winbond.com/resource-files/w25q32jv%20dtr%20revf%2002242017.pdf



Minimal testing done with fw_printenv/fw_setenv, test board did not
support dual or quad access.

Signed-off-by: Stephen Douthit <stephend@silicom-usa.com>
Tested-by: Stephen Douthit <stephend@silicom-usa.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>