msm: msm_bus: Include init_time flag during handoff locking

Toggling of init_time flag during another client's request
can cause incorrect counting of active command sets and
an incorrect index used to set the commit bit. This may
result in out of bound accesses.

Change-Id: I00525f37367edccf021189dfdb7fae34c9a1eea5
Signed-off-by: David Dai <daidavid1@codeaurora.org>