ARM: dts: ebaz4205: enable NAND support

The board features a 128MiB NAND chip and recently linux gained support
for the NAND controller on the Zynq SoC. Thus add the corresponding
devicetree nodes.

Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20210616155437.27378-4-michael@walle.cc
Signed-off-by: Michal Simek <michal.simek@xilinx.com>