drm/amdgpu: added support for register list loading (v2)

call host to  psp cmd to load reg list

v2: update to latest interface (Alex)

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: John Clements <john.clements@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>