Add SCCP SSN 0xf8 for CSS (MAP)

3GPP TS 23.003 11.9.0 adds subsystem number 0b 1111 1000 (0xF8) for CSS (MAP).

Change-Id: Iaa2b97f14f4f3c732aeff05419c0300c3a1fb121
Reviewed-on: https://code.wireshark.org/review/7533
Reviewed-by: Michael Mann <mmann78@netscape.net>

epan/dissectors/packet-sccp.c

@@ -271,6 +271,7 @@ static const value_string sccp_ssn_values[] = {
   { 0x95,  "SGSN (MAP)" },
   { 0x96,  "GGSN (MAP)" },
   /* The following national network subsystem numbers have been allocated for use within GSM/UMTS networks:*/
+  { 0xf8,  "CSS (MAP)" },
   { 0xf9,  "PCAP" },
   { 0xfa,  "BSC (BSSAP-LE)" },
   { 0xfb,  "MSC (BSSAP-LE)" },