msm: rpm_stats: update rpm_stats to get actual sleep time

Modified version of rpm stats also passes information
on the actual time in sleep on the RPM. Update rpm stats to
get such information. Also modify the updated memory
address of RPM RAM for the stats.

CRs-fixed: 471011
Change-Id: Ie734459f4183137e0fdaaa7196e8952170a47bca
Signed-off-by: Priyanka Mathur <pmathur@codeaurora.org>