mtd: cfi_mtd: populate mtd->dev with flash_info->dev

Populate mtd->dev with flash_info->dev which allows to get
full mtd information using the "mtd list" command.
Before, "mtd list" command returns :

List of MTD devices:
* nor0
  - type: NOR flash
  - block size: 0x40000 bytes
  - min I/O: 0x1 bytes
  - 0x000000000000-0x000004000000 : "nor0"

After this patch we get for example:

List of MTD devices:
* nor0
  - device: flash@0
  - parent: spi@40430000
  - driver: cfi_flash
  - path: /soc/spi@40430000/flash@0
  - type: NOR flash
  - block size: 0x40000 bytes
  - min I/O: 0x1 bytes
  - 0x000000000000-0x000004000000 : "nor0"

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/mtd/cfi_mtd.c b/drivers/mtd/cfi_mtd.c
index f998ffa..bf4473b 100644
--- a/drivers/mtd/cfi_mtd.c
+++ b/drivers/mtd/cfi_mtd.c
@@ -221,6 +221,9 @@
 			continue;
 
 		sprintf(cfi_mtd_names[i], "nor%d", i);
+#ifdef CONFIG_CFI_FLASH
+		mtd->dev		= fi->dev;
+#endif
 		mtd->name		= cfi_mtd_names[i];
 		mtd->type		= MTD_NORFLASH;
 		mtd->flags		= MTD_CAP_NORFLASH;