Revert "bfq-iosched: Set bfq_back_penalty = 1"

This reverts commit 626905b1f9f6497e77f723f7a4f3af4ccf4d7004.
Revert "bfq-iosched: Tuning for SSD"

This reverts commit 37afb6a1ec5028523046328152fba660d26c25e9.
Revert "block, bfq: add Early Queue Merge (EQM) to BFQ-v7r2 for 3.4.0"

This reverts commit 5dbead91af7b40387bda749fdf4286e4942c15c4.
Revert "block: introduce the BFQ-v7r2 I/O sched for 3.4"

This reverts commit bb0b0b364b62f5ba4e01c457d3a2f5aad0c6d73c.
block: introduce the BFQ-v7r3 I/O sched for 3.4
block, bfq: add Early Queue Merge (EQM) to BFQ-v7r3 for 3.4.0
bfq-iosched: Tuning for SSD
bfq-iosched: Set bfq_back_penalty = 1
Optimize Makefile