Also enable ACPI HMAT support, to fix boot crash or amdgpu init failure
on ALDEBARAN.

v2:
 - Use make savedefconfig to minimize the changes, skipping redundant
configs that are implied by others or have same value as default.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>