Revert "block: Switch from BFQ-v7r2 for 3.13.0 to BFQ-v7r3 for 3.13.0"

This reverts commit 5a091d397d9403d2b3d6421892354b3d644f92ac.

Causes a kernel panic immediately on boot.  Reverting for now.
Merge branch '3.13/bfq' into 3.13/master
return EOPNOTSUPP instead of in-kernel-only ENOTSUPP
kdbus.h: remove left-over documentation
remove single-called kdbus_conn_find_peer() function
remove racy calls to kdbus_conn_active()
block: Switch from BFQ-v7r2 for 3.13.0 to BFQ-v7r3 for 3.13.0

. IMPROVEMENT: Improved throughput boosting with NCQ-capable HDDs and
  random workloads. The mechanism that further boosts throghput with
  these devices and workloads is activated only in the cases where it
  does not cause any violation of throughput-distribution and latency
  guarantees.
. IMPROVEMENT: Generalized the computation of the parameters of the
  low-latency heuristic for interactive applications, so as to fit also
  slower storage devices. The purpose of this improvement is to preserve
  low-latency guarantees for interactive applications also on slower
  devices, such as portable hard disks, multimedia and SD cards.
. BUGFIX: Re-added MODULE_LICENSE macro.
. CODE IMPROVEMENTS: Small code cleanups; introduced a coherent naming
  scheme for all identifiers related to weight raising; refactored and
  optimized a few hot paths.

Signed-off-by: Paolo Valente <paolo.valente@unimore.it>
Signed-off-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com>
Reported-by: Mikhail Akushsky <namelles.one@gmail.com>
Merge branch '3.13/bfq' into 3.13/master
Merge remote-tracking branch 'kdbus/master' into 3.13/kdbus
Merge branch '3.13/kdbus' into 3.13/my
Merge remote-tracking branch 'damentz/3.13/master' into 3.13/my