Remove sccp_info member from packet_info structure.

sccp_msg_info_t* is now passed from SCCP dissector to its subdissectors through dissector data parameter.

Change-Id: Iab4aae58f8995e844f72e02e9f2de36e83589fc0
Reviewed-on: https://code.wireshark.org/review/5442
Reviewed-by: Anders Broman <a.broman58@gmail.com>