sf: probe: Add support for S25FL512S_256K

Add support for Spansion S25FL512S_256K SPI flash.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
diff --git a/drivers/mtd/spi/spi_flash_probe.c b/drivers/mtd/spi/spi_flash_probe.c
index badbbf5..d9be30f 100644
--- a/drivers/mtd/spi/spi_flash_probe.c
+++ b/drivers/mtd/spi/spi_flash_probe.c
@@ -77,6 +77,7 @@
 	{"S25FL128S_64K",  0x012018, 0x4d01,    64 * 1024,   256,		     0},
 	{"S25FL256S_256K", 0x010219, 0x4d00,    64 * 1024,   512,	             0},
 	{"S25FL256S_64K",  0x010219, 0x4d01,    64 * 1024,   512,	             0},
+	{"S25FL512S_256K", 0x010220, 0x4d00,    64 * 1024,  1024,	             0},
 	{"S25FL512S_64K",  0x010220, 0x4d01,    64 * 1024,  1024,	             0},
 #endif
 #ifdef CONFIG_SPI_FLASH_STMICRO		/* STMICRO */