update to comply with libosmocore namespace fixes

This updates the code and brings it in sync to
libosmocore git commit 892e621fec571c7cba3573caa0d328ed1b25d8ee
diff --git a/src/e1_input_vty.c b/src/e1_input_vty.c
index be51a16..d832cc5 100644
--- a/src/e1_input_vty.c
+++ b/src/e1_input_vty.c
@@ -65,7 +65,7 @@
 	"e1_input",
 	"Configure E1/T1/J1 TDM input\n")
 {
-	vty->node = E1INP_NODE;
+	vty->node = L_E1INP_NODE;
 
 	return CMD_SUCCESS;
 }
@@ -87,7 +87,7 @@
 }
 
 struct cmd_node e1inp_node = {
-	E1INP_NODE,
+	L_E1INP_NODE,
 	"%s(e1_input)#",
 	1,
 };
@@ -96,7 +96,7 @@
 {
 	install_element(CONFIG_NODE, &cfg_e1inp_cmd);
 	install_node(&e1inp_node, e1inp_config_write);
-	install_element(E1INP_NODE, &cfg_e1_line_driver_cmd);
+	install_element(L_E1INP_NODE, &cfg_e1_line_driver_cmd);
 
 	return 0;
 }