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Define the UUS data structures and add a pointer to it in RIL_Call for
MT Calls and RIL_Dial for MO calls. UUS information can be used to pass
the skypeId on some networks. Make the corresponding changes to
serialize and deserialize the data at the RIL interface.

Change-Id: Ibbd471cd062910fd4c365f76e809cfb224bd34a2