[RFC PATCH 1/3] perf: Add cpumask for uncore pmu

[Yan, Zheng]

Hi,

This patchset add a cpumask file to the uncore pmu sysfs directory.
If user doesn't explicitly specify CPU list, perf-stat only collects
uncore events on CPUs listed in the cpumask file.

As Stephane suggested, make perf-stat recognize wildcard in pmu name.
So we can easily measure event on all uncore boxes of same type.
	
Any comment is appreciated.
Thank you

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