ARM: dts: msm: power management updates for msm8916

Update mpm gpio mappings and spm sequences.
Disable SPM by default to avoid imprecise external aborts.
Define lpm levels as per cluster architecture.
Define rpm-log, rpm-stats nodes.
Update msm-pm and cpu-sleep-status nodes.

Change-Id: If67e3e4e5c8240ac0441fbacb25ee4b1e04d37c5
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>