ARM: dts: zynq: add NAND flash controller node

Recently, a driver for the ARM Primecell PL35x static memory controller
(including NAND controller) was added in linux. Add the corresponding
device tree node.

Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20210616155437.27378-3-michael@walle.cc


Signed-off-by: Michal Simek <michal.simek@xilinx.com>