mtd: spi-nor: atmel: add at25sf321 entry

mtd: spi-nor: atmel: add at25sf321 entry

Add entry for the at25sf321 32Mbit SPI flash.

This flash is populated on a custom board and was tested at
10MHz frequency using the "ti,da830-spi" SPI controller.

Link: https://www.renesas.com/en/document/dst/at25sf321-datasheet?r=1608801
Reviewed-by: Michael Walle <mwalle@kernel.org>
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>
Link: https://lore.kernel.org/r/20241116-spi-nor-v4-1-3de8ac6fd0be@gmail.com