drm/amdgpu/vcn3: drop extraneous Beige Goby hunk

Probably a rebase leftover.  This doesn't apply to SR-IOV, and
the non-SR-IOV code below it already handles this properly.

Reviewed-by: James Zhu <James.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>