ath79: cfi: cmdset_0002: amd chip 0x2201 - write words

ath79: cfi: cmdset_0002: amd chip 0x2201 - write words

Generally, in upstream CFI flash memory driver uses buffers for write
operations. That does not work with AMD chip with id 0x2201 and we must
resort to writing word sized chunks only. That is, to not apply general
buffer write functionality for this given chip.

Without the patch kernel logs will be flooded with entries like below:

MTD do_erase_oneblock(): ERASE 0x01fa0000
MTD do_write_buffer(): WRITE 0x01fa0000(0x00001985)
MTD do_erase_oneblock(): ERASE 0x01f80000
MTD do_write_buffer(): WRITE 0x01f80000(0x00001985)
MTD do_write_buffer_wait(): software timeout, address:0x01f8000a.
jffs2: Write clean marker to block at 0x01a60000 failed: -5
MTD do_erase_oneblock(): ERASE 0x01f60000
MTD do_write_buffer(): WRITE 0x01f60000(0x00001985)
MTD do_write_buffer_wait(): software timeout, address:0x01f6000a.
jffs2: Write clean marker to block at 0x01a40000 failed: -5

References: http://patchwork.ozlabs.org/project/linux-mtd/patch/20210309174859.362060-1-sandberg@mailfence.com/
Signed-off-by: Mauri Sandberg <sandberg@mailfence.com>
[added link to usptream fix submission]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
(cherry picked from commit 8cc0fa8faceadac85353bb1a96e074518ef124e2)