sf: stmicro: add geometrical info for N25Q256 from Micron

Note: because 4-byte addressing is not supported yet,
at the moment only the first 16MiB of the device are available.

Signed-off-by: Jérôme Carretero <cJ@zougloub.eu>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

drivers/mtd/spi/stmicro.c

@@ -92,6 +92,12 @@ static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = {
 		.nr_sectors = 64,
 		.name = "M25P128",
 	},
+	{
+		.idcode1 = 0x19,
+		.pages_per_sector = 256,
+		.nr_sectors = 512,
+		.name = "N25Q256",
+	},
 };
 
 struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 * idcode)