Revert "bfq-iosched: Set bfq_back_penalty = 1"

This reverts commit 6d79e53916c38338ca1d57a4426a9fef02ae2069.
Revert "bfq-iosched: Tuning for SSD"

This reverts commit 3c044fb38ec279a25f4cdda58b59233c7c82a373.
Revert "block, bfq: add Early Queue Merge (EQM) to BFQ-v7r2 for 3.4.0"

This reverts commit c17b8c606ba5f4827e1b049719b063c694295701.
Revert "block: introduce the BFQ-v7r2 I/O sched for 3.4"

This reverts commit 6f33b3d599aeadfbf5704d4266d2a22d5b56d8bc.
Revert "block: cgroups, kconfig, build bits for BFQ-v6r2 for 3.4"

This reverts commit 48fce587cde423e48a2440d5a0d5357d2449f14d.