Kconfig: Add entry for VF610 NAND NFC device tree aware driver

This commit provides code to add proper entry to Kconfig to enable
support for VF610 device tree aware driver.
Signed-off-by: NLukasz Majewski <lukma@denx.de>

drivers/mtd/nand/raw/Kconfig

@@ -88,6 +88,15 @@ config NAND_VF610_NFC
 	  The driver supports a maximum 2k page size. The driver
 	  currently does not support hardware ECC.
 
+if NAND_VF610_NFC
+
+config NAND_VF610_NFC_DT
+        bool "Support Vybrid's vf610 NAND controller as a DT device"
+        depends on OF_CONTROL && MTD
+        help
+          Enable the driver for Vybrid's vf610 NAND flash on platforms
+	  using device tree.
+
 choice
 	prompt "Hardware ECC strength"
 	depends on NAND_VF610_NFC
@@ -103,6 +112,8 @@ config SYS_NAND_VF610_NFC_60_ECC_BYTES
 
 endchoice
 
+endif
+
 config NAND_PXA3XX
 	bool "Support for NAND on PXA3xx and Armada 370/XP/38x"
 	select SYS_NAND_SELF_INIT