drm/amdgpu: retire sdma v5_2 golden settings from driver

They are initalized by hardware during power up phase,
starting from sdma v5_2 generation

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>