sf: spansion: Correct name of S25FL128S 64K Sector part

Corrected the name of S25FL128S 64K sector part SPI flash,
S25FL128S supported has been added in below commit
"sf: spansion: Add support for S25FL128S"
(sha1: 1bfb9f156aa66cca6bb9c773867a1f02a84b14be)

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
diff --git a/drivers/mtd/spi/spansion.c b/drivers/mtd/spi/spansion.c
index b3ef90f..dad4fbb 100644
--- a/drivers/mtd/spi/spansion.c
+++ b/drivers/mtd/spi/spansion.c
@@ -101,7 +101,7 @@
 		.idcode2 = 0x4d01,
 		.pages_per_sector = 256,
 		.nr_sectors = 256,
-		.name = "S25FL129P_64K/S25FL128S",
+		.name = "S25FL129P_64K/S25FL128S_64K",
 	},
 	{
 		.idcode1 = 0x0219,