msm: synx: initialize the synx object holding lock

Change initializes the synx object during creation within
the atomic context. This ensures that the initialization
does not happen until the object structures are cleaned up
by release function.

Change-Id: Ie12635349b1b043a07e05c0f575941b8cbbba042
Signed-off-by: Sumukh Hallymysore Ravindra <shallymy@codeaurora.org>