arm64: dts: intel: add device tree for n6000

[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: Liwei Song <liwei.song@windriver.com>