simplify gendisk and request_queue allocation for blk-mq based drivers

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Hi all,

this series is the scond part of cleaning up lifetimes and allocation of
the gendisk and request_queue structure.  It adds a new interface to
allocate the disk and queue together for blk based drivers, and uses that
in all drivers that do not have any caveats in their gendisk and
request_queue lifetime rules.

Diffstat:
 block/blk-mq.c                      |   91 +++++++++++++++-------------------
 block/blk.h                         |    1 
 block/elevator.c                    |    2 
 drivers/block/amiflop.c             |   16 +-----
 drivers/block/aoe/aoeblk.c          |   33 ++++--------
 drivers/block/aoe/aoedev.c          |    3 -
 drivers/block/ataflop.c             |   16 +-----
 drivers/block/floppy.c              |   20 +------
 drivers/block/loop.c                |   19 ++-----
 drivers/block/nbd.c                 |   53 +++++++------------
 drivers/block/null_blk/main.c       |   11 +---
 drivers/block/paride/pcd.c          |   19 +++----
 drivers/block/paride/pd.c           |   30 ++++-------
 drivers/block/paride/pf.c           |   18 ++----
 drivers/block/ps3disk.c             |   36 +++++--------
 drivers/block/rbd.c                 |   52 ++++++-------------
 drivers/block/rnbd/rnbd-clt.c       |   35 +++----------
 drivers/block/sunvdc.c              |   47 ++++-------------
 drivers/block/swim.c                |   34 +++++-------
 drivers/block/swim3.c               |   33 +++++-------
 drivers/block/sx8.c                 |   23 ++------
 drivers/block/virtio_blk.c          |   26 ++-------
 drivers/block/xen-blkfront.c        |   96 ++++++++++++++----------------------
 drivers/block/z2ram.c               |   15 +----
 drivers/cdrom/gdrom.c               |   45 +++++++---------
 drivers/md/dm-rq.c                  |    9 +--
 drivers/memstick/core/ms_block.c    |   25 +++------
 drivers/memstick/core/mspro_block.c |   26 ++++-----
 drivers/mtd/mtd_blkdevs.c           |   48 ++++++++----------
 drivers/mtd/ubi/block.c             |   68 ++++++++++---------------
 drivers/s390/block/scm_blk.c        |   21 ++-----
 include/linux/blk-mq.h              |   24 ++++++---
 include/linux/elevator.h            |    1 
 33 files changed, 386 insertions(+), 610 deletions(-)
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