HSD #22014852419: arm64: dts: Update NAND MTD partition for Agilex5 (#227)

commit 6e4c667df072742015ee35258528628e219c2fc8 from
https://github.com/altera-opensource/linux-socfpga.git

 socfpga-6.1.55-lts.

Updated NAND flash MTD partition in device tree to use with UBI and UBIFS
similar to agilex and s10. "u-boot" partition remain for raw u-boot image,
but "root" partition is use for UBI image containing all other components.

Signed-off-by: Niravkumar L Rabara <niravkumar.l.rabara@intel.com>
Signed-off-by: Liwei Song <liwei.song@windriver.com>