drm/amdgpu: add new atomfirmware based helpers for powerplay

New helpers for fetching info out of atomfirmware.

Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Eric Huang <JinHuiEric.Huang@amd.com>
Reviewed-by: Ken Wang <Ken.Wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
3 files changed