drm/amdgpu: add UMSCH 4.0 register headers
Add headers for UMSCH 4.0. v2: updates (Alex) Signed-off-by:Lang Yu <Lang.Yu@amd.com> Reviewed-by:
Leo Liu <leo.liu@amd.com> Reviewed-by:
Veerabadhran Gopalakrishnan <Veerabadhran.Gopalakrishnan@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com>
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