msm: rq_stats: calculate load based on current freq limit [myfluxi]
We are not using rq_stats any more so this commit is just for the
sake of completeness.  Prior to this patch, load has been calculated
based on an initial value of policy.cpuinfo.max_freq. This value may
change for several reasons: userspace settings, thermal throttling
maximum level is often not used during regular operations. This
results in unreliable calculations. Consider current policy.max to
fix this behaviour.