Revert "fix cpus sometimes stuck at max freq"

already had this.

This reverts commit ac67c9515c69cc77de5738c41db50debcaae422b.
ARM: implement flush_cache_louis()
cpufreq: scale up on incoming call

when a CPU governor applies a screen-off policy, the low frequency
makes incoming calls take several seconds to wake as the system
struggles under the load.

so this sets a flag on an incoming call, so the cpu governor can
immediately boost itself.