cpufreq: interactive: Optimize sync_freq implementation

Don't let frequency drop below sync_freq if either load or
frequency among other cpus is above a certain threshold,
not necessarily both.

Change-Id: Iada28e08e812498e16d5189b309a7314f88814dd

https://github.com/MassStash/htc_m8_kernel_GPE_5.0.1/commit/921a503fb5de7323eff0fd1f1b22c4d415c3b5b2