gprs: Fix compiler warnings in sgsn_main.c

sgsn_main.c: In function ‘main’:
sgsn_main.c:345:2: warning: implicit declaration of function ‘gprs_sndcp_vty_init’ [-Wimplicit-function-declaration]
  gprs_sndcp_vty_init();
  ^
sgsn_main.c:354:2: warning: implicit declaration of function ‘sgsn_gtp_init’ [-Wimplicit-function-declaration]
  rc = sgsn_gtp_init(&sgsn_inst);
  ^
1 file changed
tree: 1853a2cf090d7d884e57199a171cc779f4acc5df
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README