sf: winbond: Correct the nr_blocks used for W25Q32DW

This patch corrected the nr_blocks used for W25Q32DW SPI flash.

nr_blcoks are incorrectly assigned on below patch
"sf: winbond: add W25Q32DW"
(sha1: 772ba15474f73adc942e817cc072b6e9750836cc)

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
diff --git a/drivers/mtd/spi/winbond.c b/drivers/mtd/spi/winbond.c
index a7cd51f..8457808 100644
--- a/drivers/mtd/spi/winbond.c
+++ b/drivers/mtd/spi/winbond.c
@@ -89,7 +89,7 @@
 	},
 	{
 		.id			= 0x6016,
-		.nr_blocks		= 512,
+		.nr_blocks		= 64,
 		.name			= "W25Q32DW",
 	},
 	{