Revert "tools/power turbostat: adjust for temperature offset"

This reverts commit 6ff7cb37.

Apparently the TCC offset should not be used to adjust what temperature
we show the user after all.

(on most systems, TCC offset is 0, FWIW)

Fixes: 6ff7cb37

Signed-off-by: Len Brown <len.brown@intel.com>