drm/amdgpu: Modify mca block to fit for the unified ras block data and ops

1.Modify mca block to fit for the unified ras block data and ops.
2.Define special .ras_block_match function for mca block to identify itself.
3.Change amdgpu_mca_ras_funcs to amdgpu_mca_ras_block(amdgpu_mca_ras had been used), and the corresponding variable name remove _funcs suffix.
4.Remove the const flag of cma ras variable so that cma ras block can be able to be inserted into amdgpu device ras block link list.
5.Invoke amdgpu_ras_register_ras_block function to register cma ras block into amdgpu device ras block link list.
6.Remove the redundant code about cma in amdgpu_ras.c after using the unified ras block.

Signed-off-by: yipechai <YiPeng.Chai@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: John Clements <john.clements@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>