drm/amd/powerplay: implement power_dpm_state sys interface for SMU11

Add functions to get/set dpm state for SMU11.

Signed-off-by: Chengming Gui <Jack.Gui@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Kevin Wang <kevin.wang@amd.com>
Reviewd-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
5 files changed