arm64: dts: intel: add device tree for n6000

commit 6a288fb74cd186802c3f2e44eab0d318e19a668f from
https://github.com/altera-opensource/linux-socfpga.git



[upstream commit 22511e66]

Add a device tree for the n6000 instantiation of Agilex
Hard Processor System (HPS).

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Wenlin Kang <wenlin.kang@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>