python/trx: fork RadioInterfaceUHD from RadioInterface

Change-Id: I1644a3f6b8da0d5f2a1a133058269e5383948fda
diff --git a/python/trx/__init__.py b/python/trx/__init__.py
index 00d370b..17ff9d7 100644
--- a/python/trx/__init__.py
+++ b/python/trx/__init__.py
@@ -25,6 +25,7 @@
 from ctrl_if_bb import CTRLInterfaceBB
 from radio_if_grc import RadioInterfaceGRC
 from radio_if import RadioInterface
+from radio_if import RadioInterfaceUHD
 from transceiver import Transceiver
 
 from dict_toggle_sign import dict_toggle_sign