tools/power turbostat: remove duplicate pc10 column

Remove the duplicate pc10 column.

Fixes: be0e54c4

 ("turbostat: Build-in "Low Power Idle" counters support")
Reported-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Len Brown <len.brown@intel.com>