Revert "Reapply "Migrate the blkio controller to the v2 cgroup hierarchy""

This reverts commit d71f9e5fbbbc1b4a0f910c2c7606915bfeae68a4.

Reason for revert: p0 failed test (b/308687042)

Change-Id: I3d8cb899d79634bb1c80f7d05af5c1311358c25c
3 files changed