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

drivers/mtd/devices/mtd_dataflash.c

@@ -96,13 +96,6 @@ struct dataflash {
 	struct mtd_info		mtd;
 };
 
-static const struct spi_device_id dataflash_dev_ids[] = {
-	{ "at45" },
-	{ "dataflash" },
-	{ },
-};
-MODULE_DEVICE_TABLE(spi, dataflash_dev_ids);
-
 #ifdef CONFIG_OF
 static const struct of_device_id dataflash_dt_ids[] = {
 	{ .compatible = "atmel,at45", },
@@ -939,8 +932,6 @@ static struct spi_driver dataflash_driver = {
 		.name		= "mtd_dataflash",
 		.of_match_table = of_match_ptr(dataflash_dt_ids),
 	},
-	.id_table = dataflash_dev_ids,
-
 	.probe		= dataflash_probe,
 	.remove		= dataflash_remove,
 	.id_table	= dataflash_spi_ids,