drm/amdgpu: add VPE 6.1.0 header files

Add initial headers. (Ray)
Update to align with hardware changes. (Lang)
Updates (Alex)

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Lang Yu <Lang.Yu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>