drm/amdgpu: add more parameters and functions to amdgpu_umc structure

expose more parameters and functions of specific umc version to common
umc layer, so amdgpu_umc layer and other blocks could access them

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