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>
diff --git a/drivers/mtd/spi/stmicro.c b/drivers/mtd/spi/stmicro.c
index 75d6822..dbd1fc1 100644
--- a/drivers/mtd/spi/stmicro.c
+++ b/drivers/mtd/spi/stmicro.c
@@ -92,6 +92,12 @@
 		.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)