Revert "Update bfq-iosched.c"

This reverts commit 5b13c6af2ad4ee61cab2697532497de56f8d38e0.
Revert "BFQ 2"

This reverts commit 15a8af2f31df0bc6ca269cceb22704d7651956f0.
Revert "BFQ 1"

This reverts commit b985958351ad0e6d89d4e922aa46281c4073d1b9.
Revert "block: introduce the BFQ-v6 I/O sched for 3.4"

This reverts commit 2c038f82c7d74b320e23b4be8e136cf051a3daff.