mtd: spi-nor: winbond: add OTP support to w25q32fw/jw

With all the helper functions in place, add OTP support for the Winbond
W25Q32JW and W25Q32FW.

Both were tested on a LS1028A SoC with a NXP FSPI controller.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20210321235140.8308-4-michael@walle.cc