CVE-2025-22093 drm/amd/display: avoid NPD when ASIC does not support DMUB

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: avoid NPD when ASIC does not support DMUB ctx-dmubsrv will de NULL if the ASIC does not support DMUB, which is tested in dmdmubswinit. However, it will be dereferenced in dmubhwlockmgrcmd if shouldusedmublock...