kprobe: delay blacklist symbol lookup

The symbol lookup can take a long time and kprobes
is iniitilized very early in boot, So delay symbol
lookup until the blacklist is first used.

Signed-off-by: Rahul Sharma <sharah@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
block: Switch from BFQ-v7r4 for 3.4.0 to BFQ-v7r5 for 3.4.0

CHANGELOG

v7r5:

. IMPROVEMENT: Improve throughput boosting by idling the device
  only for processes that, in addition to perform sequential I/O,
  are I/O-bound (apart from weight-raised queues, for which idling
  is always performed to guarantee them a low latency).
. IMPROVEMENT: Improve throughput boosting by depriving processes
  that cooperate often of weight-raising.
. CODE IMPROVEMENT: Pass of improvement of the readability of both
  comments and actual code.