msm: rq_stats: Fix missing initalization of cur_freq

Initialize 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 intialized.

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

Change-Id: I950686deff02e2339eefae7d09392dda2174a545
CRs-fixed: 446017
Signed-off-by: Venkat Devarasetty <vdevaras@codeaurora.org>