hammerhead: Remove the maxcpus arg

 * This is fixed in the kernel now.

Change-Id: Icfde43adfb9db4402232e7ef71e3e197dc193d43
hammerhead: Enable new PM architecture

 * Update mode paths in sysfs
 * Configure devfreq bandwidth monitor
 * Disable userspace input boost
 * Reenable cpu-boost driver
 * Fix thermal-engine.conf for perf compat
 * Enable full idle power collapse on all cores
 * And don't let mpdecision mess with any of it

Change-Id: I26ada15fa3bec5eefec7f560824e4e27413e078c