CVE-2026-81016 platform/x86/amd/pmc: Propagate SMU errors and validate S2D address

In the Linux kernel, the following vulnerability has been resolved: platform/x86/amd/pmc: Propagate SMU errors and validate S2D address amdstbs2dinit discards the return value of several S2D SMU commands. When the SMU refuses a command e.g. "SMU cmd failed. err: 0xff" the failure is only noticed...