powercap/intel_rapl: Track active CPUs internally

The ability of the CPU hotplug code to stop online/offline at each step
makes it necessary to track the activated CPUs in a package directly,
because outerwise a CPU offline callback can find CPUs which have already
executed the offline callback, but are not yet marked offline in the
topology mask. That could make such a CPU the package leader and in case
that CPU goes fully offline leave the package lead orphaned.

Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Jacob Pan <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

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