msm: synx: refactoring synx signal function

Refactoring the synx signal functionality to separate
synx signal api with actual core signaling functionality.
This allows methods invoking signaling function already
with synx object row reference from searching again through
synx id.

Change-Id: I919ab2ae56cbea49fcfd93d50cb7488297a84895
Signed-off-by: Sumukh Hallymysore Ravindra <shallymy@codeaurora.org>