drm/amdgpu: add mmhub powergating set by smu

PSP will disable legacy mmhub PG setting that is programming
registers, and drive will use SMC message to
set it up.

Signed-off-by: Eric Huang <JinHuiEric.Huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed