AMD Models 90h-9fh are APUs. They have built-in HBM3 memory. ECC support
is enabled by default.

APU models have a single Data Fabric (DF) per Package. Each DF is
visible to the OS in the same way as chiplet-based systems like Zen2
CPUs and later. However, the Unified Memory Controllers (UMCs) are
arranged in the same way as GPU-based MI200 devices rather than
CPU-based systems.

Use the existing gpu_ops for hetergeneous systems to support enumeration
of nodes and memory topology with few fixups.

  [ bp: Massage comments. ]
Signed-off-by: Muralidhara M K <muralidhara.mk@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231102114225.2006878-5-muralimk@amd.com