perf kvm: Use NSEC_PER_USEC

Following kernel practices and better documenting units of time.

Cc: Adrian Hunter <[email protected]>
Cc: Alexander Yarygin <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Hemant Kumar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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