am 7f148d65: Merge change 4316 into donut

Merge commit '7f148d65051e577cc4a002183ec55d625b51de85'

* commit '7f148d65051e577cc4a002183ec55d625b51de85':
  Revert "dumpstate: Temporarily disable dumping /proc/slabinfo to avoid kernel crash."
  Enable more debug message to debug the Camera startPreview bug.