ARM: zynq: Describe nand device in DT

ARM: zynq: Describe nand device in DT

Linux requires to describe nand structure under nand controller.
If it is not described nand device is not detected by Linux.

Error shown by Linux kernel:
pl35x-nand-controller e1000000.nand-controller: Incorrect number of NAND chips (0)
pl35x-nand-controller: probe of e1000000.nand-controller failed with error -22

When wired:
nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xda
nand: Micron MT29F2G08ABAEAWP
nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/3fcd68ccdfed5e6c079681e3b29e06583ec8a375.1695378830.git.michal.simek@amd.com