msm: cvp: Fence path for Lahaina

Camera requires new features supported in cvp driver but the existing
camera fence path framework in cvp driver is not scable.Redesign fench
path to enhance its scability by adding worker thread pool.

Change-Id: If8b31ddb082089463aca1f3d600a9fed1ed05996
Signed-off-by: Ruofei Ma <ruofeim@codeaurora.org>