msm: lpm-levels: Add support for reporting statistics.

The pm-stats drivers is rearchitected to support multiple clusters and
report the statistics of individual resources. Add support to invoke the
new APIs to appropriately report the pm-stats for clusters and cpus

Change-Id: Ibcae9e79a2df39a74247968fce89c72a996d9ad3
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>