gprs_ns2: drop prefix of all internal exposed function

All functions which are exposed by gprs_ns2_internal.h should not contain
the public prefix gprs_. Internal function should only contain ns2_ prefix.

Change-Id: Icecc5a918902cd10efac72bbac20780d39aab272
diff --git a/src/gb/gprs_ns2_vty.c b/src/gb/gprs_ns2_vty.c
index 36a7f78..d6674ff 100644
--- a/src/gb/gprs_ns2_vty.c
+++ b/src/gb/gprs_ns2_vty.c
@@ -298,7 +298,7 @@
 	vty_out(vty, "NSEI %05u: %s, %s%s", nse->nsei, gprs_ns2_lltype_str(nse->ll),
 		nse->alive ? "ALIVE" : "DEAD", VTY_NEWLINE);
 
-	gprs_ns2_sns_dump_vty(vty, " ", nse, stats);
+	ns2_sns_dump_vty(vty, " ", nse, stats);
 	llist_for_each_entry(nsvc, &nse->nsvc, list) {
 		if (persistent_only) {
 			if (nsvc->persistent)
@@ -418,7 +418,7 @@
 
 static int nsvc_force_unconf_cb(struct gprs_ns2_vc *nsvc, void *ctx)
 {
-	gprs_ns2_vc_force_unconfigured(nsvc);
+	ns2_vc_force_unconfigured(nsvc);
 	return 0;
 }