msm_rq_stats: squash commit to latest version

This patch contains:

msm:rq_stats: Add hotplug disable attribute
(https://github.com/n3ocort3x/android_kernel_htc_msm8960/commit/281ff6df124aa66a3155eac5a74554687736bc06)
msm:rq_stats: Fix hotplug attribute during the suspend failure
(https://github.com/n3ocort3x/android_kernel_htc_msm8960/commit/f6b01ee655c60e625674a956559190ec060c7888)
msm:rq_stats: Register for Cpufreq policy notification
(https://github.com/n3ocort3x/android_kernel_htc_msm8960/commit/84245520c04ab33dbd147758e8f5fc7415e51e33)
msm_rq_stats: squash commit to latest version
(https://github.com/n3ocort3x/android_kernel_htc_msm8960/commit/2f132bd1208dcb7961baa7e09230cb5f99d2fc7b)