apps/grgsm_trx: introduce bind address option

The new option (-b --bind-addr) allows one to specify the bind
address for both DATA and CTRL interfaces. By default, '0.0.0.0'
is used, so there are no restrictions for the L1 source address.

Change-Id: I3339f686b53db07cfd1bff9a516f4bdc28058cd9
diff --git a/python/trx/ctrl_if_bb.py b/python/trx/ctrl_if_bb.py
index 7886e23..f5a9fa3 100644
--- a/python/trx/ctrl_if_bb.py
+++ b/python/trx/ctrl_if_bb.py
@@ -26,9 +26,10 @@
 from ctrl_if import ctrl_if
 
 class ctrl_if_bb(ctrl_if):
-	def __init__(self, remote_addr, remote_port, bind_port, tb, pm):
+	def __init__(self, remote_addr, remote_port, bind_addr, bind_port, tb, pm):
 		print("[i] Init CTRL interface")
-		ctrl_if.__init__(self, remote_addr, remote_port, bind_port)
+		ctrl_if.__init__(self, remote_addr, remote_port,
+			bind_addr, bind_port)
 
 		# Set link to the follow graph (top block)
 		self.tb = tb