mtd: nand: pxa3xx: set mtd->dev

Currently the pxa3xx driver does not set the udevice in the mtd_info
struct and this prevents the mtd from parsing the partitions via DTS
like for SPI-NOR.

So simply set the mtd->dev to the driver udevice.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/mtd/nand/raw/pxa3xx_nand.c b/drivers/mtd/nand/raw/pxa3xx_nand.c
index 3a9c9ca..20d1aee 100644
--- a/drivers/mtd/nand/raw/pxa3xx_nand.c
+++ b/drivers/mtd/nand/raw/pxa3xx_nand.c
@@ -1913,6 +1913,7 @@
 		 * user's mtd partitions configuration would get broken.
 		 */
 		mtd->name = "pxa3xx_nand-0";
+		mtd->dev = dev;
 		info->cs = cs;
 		ret = pxa3xx_nand_scan(mtd);
 		if (ret) {