msm: rq_stats: Support to know cpu utilization in userspace

Support to read utilization stats from userspace, used by
mpdecision. This implementation is independent of governor
and sampling rates.

Change-Id: I678c7462ba77d84ce4c51c36a61da7ac99ffecc8
Signed-off-by: Narayanan Gopalakrishnan <nargop@codeaurora.org>
Signed-off-by: Ajay Dudani <adudani@codeaurora.org>

Conflicts:

	arch/arm/mach-msm/msm_rq_stats.c
msm: rq_stats:squashed set of commits
	- Support to know cpu utilization in userspace
	- Fix lockdep warnings with key's not in .data