drm/amdgpu: add umc v6_1_1 IP headers
the change introduces IP headers for unified memory controller (umc) Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com> Reviewed-by: Dennis Li <dennis.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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