BoardConfig: Use qcom power HAL
overlay: Add support for performance profiles
Revert "init.hammerhead: Add permissions for userspace cpu-boost driver"

This reverts commit cd6300f20fdb1bf885057587323bdfe9cb2ae925.
init.hammerhead: Use Oppo MSM8974 performance settings
hammerhead: Optimize I/O scheduling

Inspired by bacon. We aren't suffering from slowdowns
during bootanim, anyway this is the right way to do it.

Change-Id: Icf3d9d6e52926012a4b7fdfdc1456a37ad782e71