ANDROID: block: Revert "Preserve the order of requeued requests"

Revert commit 5d90f7cb ("ANDROID: block: Preserve the order of
requeued requests") because it is no longer needed. A mechanism has
been added in the SCSI core for sorting zoned writes by LBA. This
patch includes changes to compensate for the move of the requeue_work
member from struct request_queue into struct internal_request_queue.

Bug: 298142254
Change-Id: I35161cfff058d518c3ac5835c6bfcedb8fb567c7
Signed-off-by: Bart Van Assche <bvanassche@google.com>