perf kvm: Use perf_evsel__intval

Using plain raw_field_value(evsel->tp_format) will look at the common
fields as well, and since this tool doesn't need those, speed it up a
bit by looking at just the event specific fields.

Also in general use just evsel and sample, just like was done in 'perf
sched'.

v2: Fixed up test against evsel->name, that contains the subsys name
too, by David Ahern.

Cc: David Ahern <[email protected]>
Cc: Dong Hao <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Xiao Guangrong <[email protected]>
Cc: Runzhen Wang <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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