[processor] handle msr module loading via predicate

[arif-ali]

The cpupower and turbostat applications are not installed by default on most environments, but where it is, it will load the msr module when running this commends. Adding the predicate will solve this.

Closes: #3610
Related: #3624, SET-622

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[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo yum install -y dnf-plugins-core on RHEL 8
• sudo dnf install -y dnf-plugins-core on Fedora
• dnf copr enable packit/sosreport-sos-3625
• And now you can install the packages.

Please note that the RPMs should be used only in a testing environment.