Revert "[PATCH] AIO: Don't plug the I/O queue in do_io_submit()"

There is a non-boot issue since the latest kernel changes which are solved by flashing an older kernel. Reverting all the kernel updates to be able to investigate in more detail.

This reverts commit 8b48d41b2e770a771c38bef91f2ae657ecd8906e.

Change-Id: I4bbfda7bc9b1aa3c0be4d8adcb0f14d81cb021d0