Main goal being to eliminate the somewhat risky, as identified in earlier
discussion, use of per-CPU data indexed by struct cpufreq_policy's cpu
field.

1: eliminate cpufreq_drv_data[]
2: hwp: move driver data into policy
3: amd-cppc: move driver data into policy
4: amd-cppc: move epp_init into driver data
5: amd-cppc: move pxfreq_mhz into driver data

Jan