msm: ipa: rm: remove internal synchronization objects

Remove internal synchronization objects (locks) which were meant to
make the code more efficient.
After some bugs were discovered, bigger granularity locks were added,
which made the internal locks redundant. Removing the internal, redundant
locks makes the code more maintainable.

Change-Id: I648c4a7d4c0cb5434db458ad3eb4db1c9c25d7cc
Signed-off-by: Gidon Studinski <gidons@codeaurora.org>