CVE-2026-89827 drm/amdgpu: avoid force-completing uninitialized UVD rings

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: avoid force-completing uninitialized UVD rings uvdv70swinit does not initialize the UVD decode ring for an SR-IOV VF. However, amdgpuuvdresume unconditionally force-completes the decode ring when restoring its fence...