msm: msm_bus: fix memory allocation issues

Memory for some of the fields in the rule structure
is not allocated during the rule registration time.
This patch addresses these memeory allocation issues
and frees the same during the un-registration.

Change-Id: I62e437d6c2cfa57d9f4b4afa86b99ecf383b36aa
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>