msm: msm_bus: Fix out of bounds array accesses

Fix a corner case where during init time where the
count for the number of active commands differed from
the count when generating the commands. Fix the index
to set the commit bit when the last BCM in the commit
queue is not part of the generated active commands.

Change-Id: I422e5974eee35fc49aa9858cc5d7ff515fcbf0a0
Signed-off-by: David Dai <daidavid1@codeaurora.org>