Revert "Revert "msm8974-common: use qcom bionic optimization""

This reverts commit 6c3a7c1d092e7d56a3dd767186c38c7305d45b14.
Revert "Disable sepolicy, thanks to christer12 https://github.com/christer12/android_device_samsung_msm8974-common/commit/f0241ebfdd480691b68c6898ac7b7fee7c92aec3"

This reverts commit 5c745fba8fc89a4f567f8901b733c43ef58bb069.