sf: winbond: add support W25Q64 parts

Adds support for Winbond's W25Q64 SPI flash. These devices are used on
(among others) Xilinx' SP601 and SP605 Spartan-6 evaluation boards.
Tested with "sf" commands.

Signed-off-by: Graeme Smecher <graeme.smecher@mail.mcgill.ca>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

drivers/mtd/spi/winbond.c

@@ -27,6 +27,7 @@
 #define WINBOND_ID_W25X16		0x3015
 #define WINBOND_ID_W25X32		0x3016
 #define WINBOND_ID_W25X64		0x3017
+#define WINBOND_ID_W25Q64		0x4017
 
 #define WINBOND_SR_WIP		(1 << 0)	/* Write-in-Progress */
 
@@ -77,6 +78,14 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = {
 		.nr_blocks		= 128,
 		.name			= "W25X64",
 	},
+	{
+		.id			= WINBOND_ID_W25Q64,
+		.l2_page_size		= 8,
+		.pages_per_sector	= 16,
+		.sectors_per_block	= 16,
+		.nr_blocks		= 128,
+		.name			= "W25Q64",
+	},
 };
 
 static int winbond_wait_ready(struct spi_flash *flash, unsigned long timeout)