fuse: give wakeup hints to the scheduler

Use synchronous wakeup interface to wakeup the userspace daemon. Scheduler
can make use of this hint to find a better CPU for the waker task.

Change-Id: I7d077235f9b8fe771869dd7e6fccee7d356d858b
Suggested-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Pradeep P V K <pragalla@codeaurora.org>