drm/amd/pm: enable gfxoff feature for SMU 13.0.0

The feature is ready with latest 78.58.0 PMFW.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>