Add callback set information into prepare interface

Add callback set information into prepare interface

- Requirement:
Server wants to information about whether the client set the service
state changed callback.

- Solution:
Service state is frequently changed, so IPC for notification of service
state change is invoked so many times for all client. However, most of
the client did not register the callback, so many resource can be
wasted by this unvaluable invocation. To reduce wasted resources, this
patch adds callback registration information into IPC interface.
Through this new information server can send valid  notification without
waste.

Change-Id: I8a70b694854eefa9c1f2e58726cb6f4c54ba2f65
Signed-off-by: Suyeon Hwang <stom.hwang@samsung.com>