msm_mpdecision: fixes and cleanup
- additional checks for max_cpus and min_cpus changes in sysfs
- no need to check above again in mp_decision, eliminate if statements
- if min_cpus == CONFIG_NR_CPUS no need to do mpdecision when
  screen is on, save some overhead
- adapt dual-core parameters for NwNs and TwTs thresholds
- space patrol: use tabs consistent with the rest of Linux kernel