msm: kgsl: Add power settings to the postmortem dump

The Nap & StartStop-on-SleepWake config information will help to analyze
hangs due to incorrect power state transitions.

Change-Id: If00009b7800d72fe2e6682457652aa42d4a0aee6
Signed-off-by: Ranjhith Kalisamy <ranjhith@codeaurora.org>