msm: cvp: Fix an issue in DME API

DME hfi fence function doesn't call put inst on return,
which is blocking inst from being released. Add put inst
in DME hfi fence to fix this.

Change-Id: I9b1cec2ef332b5fed2860638264b3faabf1d50f3
Signed-off-by: Ruofei Ma <ruofeim@codeaurora.org>