Revert "cpufreq: add io_is_busy"

This reverts commit 51566d80e0d60e71577d29fa3843a327578bdef2.
Revert "soc: qcom: rq_stats: remove the redundant iowait check"

This reverts commit ada3b6f762419fd0734fd07e750d5665a18715e3.
cpufreq: add io_is_busy