Revert "msm: msm_rq_stats: Add proper attribute to enable hotplug"

This reverts commit 6822c401e18f3c123a1672d3172baff01696a033.
Revert "msm: rq_stats: Disable hotplug and stats by default"

This reverts commit 2f0d7563d9cd398204f7f75fb0498019d3ff0127.
Revert "msm: rq_stats: Calculate load based on current freq limit"

This reverts commit e49b3e673293137af36b3041a070871dfc299e30.