msm: rq_stats: Fix missing initialization of cur_freq
iInitialize cur_freq variable of each online cpu to the current
running cpu clock frequency. This avoids zeroing out the load
calculations until the first notification of the change in CPU
frequency comes in after CPUFREQ governors are initialized.

Also, when non boot cpu is up, update its cur_freq variable.

(Cherry picked offline, credits below -CvD)

Venkat Devrasetty <vdevaras@codeaura.org>
franciscocranco <franciscofranco.199@gmail.com>