[VTY] T3212 scaling is 6 minutes

The scaling of T3212 is in units of 6 minutes, not 10 minutes.
diff --git a/openbsc/src/bsc_vty.c b/openbsc/src/bsc_vty.c
index 99b050b..97641f2 100644
--- a/openbsc/src/bsc_vty.c
+++ b/openbsc/src/bsc_vty.c
@@ -411,7 +411,7 @@
 		bts->si_common.cell_sel_par.rxlev_acc_min, VTY_NEWLINE);
 	if (bts->si_common.chan_desc.t3212)
 		vty_out(vty, "  periodic location update %u%s",
-			bts->si_common.chan_desc.t3212 * 10, VTY_NEWLINE);
+			bts->si_common.chan_desc.t3212 * 6, VTY_NEWLINE);
 	vty_out(vty, "  channel allocator %s%s",
 		bts->chan_alloc_reverse ? "descending" : "ascending",
 		VTY_NEWLINE);
@@ -1658,7 +1658,7 @@
 {
 	struct gsm_bts *bts = vty->index;
 
-	bts->si_common.chan_desc.t3212 = atoi(argv[0]) / 10;
+	bts->si_common.chan_desc.t3212 = atoi(argv[0]) / 6;
 
 	return CMD_SUCCESS;
 }