cpufreq: cpuboost: Restructure boost mechanism

* After tuning interactive frequencies and this restructure
  cores are no longer getting stuck, so revert 84c93463ef654b72d194afae6b7d27ae$
* Remove additional checks to lighten cpu boost events.
* After testing, unified hotplug boost is working great,
  so enable by default.
* Load based sync is enabled by default as well.
* Add debug prints to let devs debug and check.
* CAF default for migration threshold is 15 which seems
  way small, use 30 instead.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>