mtd: spi-nor: Check bus width while setting QE bit

spi_nor_write_16bit_sr_and_check() should also check if bus width is
4 before setting QE bit.

Fixes: 39d1e334 ("mtd: spi-nor: Fix clearing of QE bit on lock()/unlock()")
Suggested-by: Michael Walle <michael@walle.cc>
Suggested-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20230818064524.1229100-2-hsinyi@chromium.org


Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>