mtd: spi-nor: spansion: add die erase support in s28hx-t

mtd: spi-nor: spansion: add die erase support in s28hx-t

S28Hx-T family has multi-die devices that support die erase opcode.
Update die erase opcode when the device is multi-die.

Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Takahiro Kuwano <takahiro.kuwano@infineon.com>
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>