mtd: dataflash: remove duplicate SPI ID table

Building with -Werror=override-init reveals that two patches added
the same device ID table to this driver:

drivers/mtd/devices/mtd_dataflash.c:946:27: error: initialized field overwritten [-Werror=override-init]
  946 |         .id_table       = dataflash_spi_ids,
      |                           ^~~~~~~~~~~~~~~~~
drivers/mtd/devices/mtd_dataflash.c:946:27: note: (near initialization for 'dataflash_driver.id_table')

Remove one of the copies.

Fixes: 27a030e8 ("mtd: dataflash: Add device-tree SPI IDs")
Fixes: ac4f8348 ("mtd: dataflash: Add SPI ID table")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20221215164736.1315815-1-arnd@kernel.org