Revert "[PATCH 1/3] block: prepare I/O context code for BFQ-v6 for 3.0"

This reverts commit 3c11e89e60a0a4089db9207cd762a041113e4bdc.
Revert "[PATCH 2/3] block: cgroups, kconfig, build bits for BFQ-v6-3.0"

This reverts commit 842ff0615e844a41575cd52161e50285208d0dd7.
Revert "[PATCH 3/3] block: introduce the BFQ-v6 I/O sched for 3.0"

This reverts commit 7e8a05384d8bdecefafd4f12ad751a50f27df342.
mach-msm: bravo: use cfq