mtd: spi-nor: spansion: enable die erase for multi die flashes

Enable die erase for spansion multi die flashes.

Tested-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Link: https://lore.kernel.org/r/20231125123529.55686-3-tudor.ambarus@linaro.org


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