Revert "block: Switch from BFQ-v7r6 for 3.4.0 to BFQ-v7r7 for 3.4.0"

This reverts commit ce8db3d93441c07e6c1c5a083f1de42ba3f1171f.
Revert "block: Switch from BFQ-v7r5 for 3.4.0 to BFQ-v7r6 for 3.4.0"

This reverts commit bf69b9b3c883b4be395263f7734adafa4ef55953.
Revert "bfq 3"

This reverts commit c7a66111a0b71cf1c575ce8bf68e1a784fa72e26.
Revert "bfq 4"

This reverts commit 2f1f16eee7146d38c844c177ea51c2ff433469dc.
Revert "bfq 5"

This reverts commit 2d17dc44bcfce608e5617095de533ff6211c227a.
Revert "bfq 6"

This reverts commit d79c64bfb4d8b03b82bc8fe22dffb89096e2ddaa.
Revert "bfq 7"

This reverts commit 924fd0da4dbf68c5a3fc81ed759b01865ca5307b.