zynq: mtd: nand: Move zynq nand driver to driver model

Move the zynq nand driver to driver model. Select DM_MTD if
zynq nand controller (NAND_ZYNQ) is selected.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index ec17653..5de72fb 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -281,6 +281,7 @@
 config NAND_ZYNQ
 	bool "Support for Zynq Nand controller"
 	select SYS_NAND_SELF_INIT
+	select DM_MTD
 	imply CMD_NAND
 	help
 	  This enables Nand driver support for Nand flash controller