Revert "Revert "Add BFQ v6r2 I/O scheduler, make it the default""

This reverts commit b384f64de7e7b5e9a8c364c6cbaaa9c71f8eeeab.
Revert "Enable PAX_REFCOUNT"

This reverts commit 117d91c2ed18109d630b98aaf6d83e1e3369a8c5.
Revert "Deny reading/writing to /dev/kmem, /dev/mem, and /dev/port"

This reverts commit 741312b776a9c823d45820848e7f043da64d9886.
Revert "Disable PAX_RANDMMAP as zygote was crashing with this option"

This reverts commit 8ddc2d983e2a9ad37134ec89a99e3bd9a6c2ba66.
Revert "Enable most PaX features"

This reverts commit a6bf23c13ed8a694dd203589169217618795ae1d.
Revert "Enable most GrSec options"

This reverts commit b897404868ff36bb607793aaa3cab675036cbeb7.
Revert "Disable BFQ by default"

This reverts commit f5857335e81b236c57cc2a14ac91d4c5a078b269.
Revert "grsec 2.9.1 part 2"

This reverts commit fd5a9fe2f72bc5fbc6b9043e326033943700977c.
Revert "import grsec 2.9.1 (part 1)"

This reverts commit 6ec1beeddeb0ae72c50298ba75004845ce51556b.
Revert "Add BFQ v6r2 I/O scheduler, make it the default"

This reverts commit 650ec6f4d50b39775914eea32b561f2e65c394c5.