perf/x86/amd/power missing pmu::module initialisation

[Mark Rutland]

Hi,

As a heads-up, I believe that arch/x86/events/amd/power.c is currently
missing initialisation of pmu::module, which could result in problems
when the module is unloaded.

We've just spotted a similar problem in a couple of ARM PMUs, and AFAICT
the AMD power PMU is the only other PMU affected.

Other modular PMUs all initialise this to THIS_MODULE prior to calling
perf_pmu_register().

Thanks,
Mark.