msc: vty: Fix integer printf formatting

| ../../../git/src/libmsc/msc_vty.c:1202:44: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'uint64_t {aka long long unsigned int}' [-Wformat=]
|   vty_out(vty, "Location Update         : %lu attach, %lu normal, %lu periodic%s",
|                                             ^

Change-Id: Iae1c0b20a519ce71a21f72cea3c63694ef10adb4
1 file changed