GPRS: BVCI 0 and 1 are not permitted.

According to TS 08.18, BVCI=0 is for the SIGNALLING entity,
and BVCI=1 is for the PTM entity.  Both should not be used
by the PTP entity that we're configuring here.

openbsc/src/vty_interface.c

@@ -1392,7 +1392,7 @@ DEFUN(cfg_bts_per_loc_upd, cfg_bts_per_loc_upd_cmd,
 }
 
 DEFUN(cfg_bts_prs_bvci, cfg_bts_gprs_bvci_cmd,
-	"gprs cell bvci <1-65535>",
+	"gprs cell bvci <2-65535>",
 	"GPRS BSSGP VC Identifier")
 {
 	struct gsm_bts *bts = vty->index;