tools/power turbostat: enable turbostat to support Knights Landing (KNL)

Changes mainly to account for minor differences in Knights Landing(KNL):
1. KNL supports C1 and C6 core states.
2. KNL supports PC2, PC3 and PC6 package states.
3. KNL has a different encoding of the TURBO_RATIO_LIMIT MSR

Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --cc arch/x86/include/uapi/asm/msr-index.h
Simple merge

diff --cc tools/power/x86/turbostat/turbostat.c
Simple merge