drm/amdgpu: add VCN2.0 decode ib test

Add internal register offset for registers involving in ib tests

Signed-off-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
3 files changed