SilverCore V8.0

Changelog:
• Upstream to latest linux tag v4.9.252
• Rebase on LA.UM.9.3.r1-00500-sdm845.0 caf tag
• Drop stune assist & cpuset assist
• Don't limit min and max cpu freq
• Disable KLAPSE
• Enable srandom
• Enable MSM Performance & disable touchboost by default
• Misc fixes and improvement