perf tools: Move hex2u64 into util object

perf tools: Move hex2u64 into util object

Moving hex2u64 function into util object.

Signed-off-by: Jiri Olsa <[email protected]>
Reviewed-by: Namhyung Kim <[email protected]>
Tested-by: Namhyung Kim <[email protected]>
Cc: Corey Ashford <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>