soc: qcom: rq_stats: remove the redundant iowait check

Iowait_time check is redundant and it would lead to heavy load
due to miscaluculation of idle time. Hence remove this check
as iowait will considered based on io_busy flag.

[myfluxi: Adapt to msm 8974]

Change-Id: I4dd9f9c79205eca588daea8cc0fe892394a83391
CRs-fixed: 662052
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>
msm_rq_stats: Removed useless cur_iowait_time references.
Add correct IO IS BUSY set for CPU Govs and HotPlugs.

Conflicts:

	arch/arm/mach-msm/msm_hotplug.c
	drivers/cpufreq/cpufreq_conservative.c
	drivers/cpufreq/cpufreq_interactive.c
	drivers/cpufreq/cpufreq_ondemand.c
	drivers/cpufreq/cpufreq_ondemandplus.c