kernel: cpufreq: amd-pstate: fix memory leak on CPU EPP exit

In the Linux kernel, the following vulnerability has been resolved: cpufreq: amd-pstate: fix memory leak on CPU EPP exit The cpudata memory from kzalloc in amdpstateeppcpuinit is not freed in the analogous exit function, so fix that. rjw: Subject and changelog edits...