LS1021AQDS support NAND flash on IFC chip-select 2.

So add NAND node in device tree for IFC controller.
Signed-off-by: NJagdish Gediya <jagdish.gediya@nxp.com>
Signed-off-by: NPrabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>