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

This reverts commit f99ca8aeb1d20218663911ec3d1ea12b2ee9fd05.

Reason for revert: b/2768906

Change-Id: I9ce259a2c96e9f8dd8c7598204c35922b56f7a0a
3 files changed