KVM: perf: kvm events analysis tool

Changlog:
There are some changes from David Ahern's review:
- let the tool to be off-box analysis by getting cpu isa
  from HEADER_CPUID feature and removing max-vcpu related code.

- attach per vcpu record structure to the thread by adding a void pointer
  in "struct thread".

- remove unnecessary tool argument(-v).

The output example is following:
# ./perf kvm-events report --event mmio --vcpu 3
  Warning: Error: expected type 5 but read 4
  Warning: Error: expected type 5 but read 0
  Warning: unknown op '}'


Analyze events for VCPU 3:

         MMIO Access    Samples  Samples%     Time%         Avg time

        0xfee00380:W      45534    78.00%    84.76%      5.27us ( +-   0.77% )
        0xfee00300:W       4280     7.33%     9.37%      6.20us ( +-   1.91% )
        0xfee00300:R       4280     7.33%     3.34%      2.21us ( +-   1.53% )
        0xfee00310:W       4280     7.33%     2.52%      1.67us ( +-   0.71% )

Total Samples:58374, Total events handled time:283257.68us.

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