drm/amdgpu: Enable persistent edc harvesting in APP APU

Persistent edc harvesting is supported in APP APU

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>