drm/amdgpu: add sdma support for sdma 6.0.1

Add sdma 6.0.1 support to sdma6 implementation.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Aaron Liu <aaron.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>