Revert "block, bfq: add Early Queue Merge (EQM) to BFQ-v7r5 for 3.0.0"

This reverts commit a13ecc5709df15517d86135171529124b9bde7a8.
Revert "block: introduce the BFQ-v7r5 I/O sched for 3.0"

This reverts commit 66e1994fb00be7745ea518a3ed2489aba0cc9ac9.
Revert "block: cgroups, kconfig, build bits for BFQ-v7r5-3.0"

This reverts commit d6f21d13827c9495a6b9f9a89a4f4c848147bbaa.
Revert "block: prepare I/O context code for BFQ-v7r5 for 3.0"

This reverts commit e821a3e5840122048cc4382206e3af68fc65f911.
BFQ 3.0.0-v7r7
AK: Cleanup configs
R4P0 is obsolete