Revert "msm:rq_stats: Register for Cpufreq policy notification"

This is not needed now that we are calculating load based on userspace max cpufreq.

This reverts commit 6b1e7c36e2d8dc0d706353414a3733292e6b73f2.

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>