ARM: dts: aspeed: Add NVIDIA MSX4 HPM

ARM: dts: aspeed: Add NVIDIA MSX4 HPM

The NVIDIA MSX4 HPM (host platform module) is a reference board for
managing up to 8 PCIe connected NVIDIA GPUs via ConnectX-8 (CX8)
SuperNICs. The BMC manages all GPUs and CX8s for both telemetry and
firmware update via MCTP over USB. The host CPUs are dual socket Intel
Granite Rapids processors.

For more detail on this architecture:

https://developer.nvidia.com/blog/nvidia-connectx-8-supernics-advance-ai-platform-architecture-with-pcie-gen6-connectivity/

Signed-off-by: Marc Olberding <molberding@nvidia.com>
Link: https://patch.msgid.link/20251126-msx1_devicetree-v5-2-e508d13e2dda@nvidia.com
[arj: Reflow text to wrap at limit, whitespace, grammar]
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>