x86: Add cpufreq logic to S3 suspend/resume

x86: Add cpufreq logic to S3 suspend/resume

When suspend to S3, stop the cpufreq dbs governor. When resume from
S3, firstly sync cpu state and freq at the 1st dbs timer; from 2nd dbs
timer on, cpufreq dbs governor control cpu px transfer according to
its workload algorithm. Px statistic is also handled.

Signed-off-by: Liu Jinsong <jinsong.liu@intel.com>