gbproxy: Use gbproxy_ for all structures

The application is called gbproxy but the structures and functions
were inconsistently named as either gbprox or gbproxy. Rename all
structures to use gbproxy.

Done with Jacob
diff --git a/openbsc/tests/gbproxy/gbproxy_test.c b/openbsc/tests/gbproxy/gbproxy_test.c
index 6905fe2..9fceabf 100644
--- a/openbsc/tests/gbproxy/gbproxy_test.c
+++ b/openbsc/tests/gbproxy/gbproxy_test.c
@@ -69,7 +69,7 @@
 
 static int dump_peers(FILE *stream, int indent)
 {
-	struct gbprox_peer *peer;
+	struct gbproxy_peer *peer;
 	struct gprs_ra_id raid;
 	unsigned int i;
 	const struct rate_ctr_group_desc *desc;
@@ -81,8 +81,8 @@
 		return rc;
 
 	llist_for_each_entry(peer, &gbcfg.bts_peers, list) {
-		struct gbprox_tlli_info *tlli_info;
-		struct gbprox_patch_state *state = &peer->patch_state;
+		struct gbproxy_tlli_info *tlli_info;
+		struct gbproxy_patch_state *state = &peer->patch_state;
 		gsm48_parse_ra(&raid, peer->ra);
 
 		rc = fprintf(stream, "%*s  NSEI %u, BVCI %u, %sblocked, "