Fix improper import in asfvolt16 adapter

Change-Id: I4dd91101bcc48e88709736515dbe13026f76bbb3
diff --git a/voltha/adapters/asfvolt16_olt/asfvolt16_olt.py b/voltha/adapters/asfvolt16_olt/asfvolt16_olt.py
index 6ef04ce..7ea8ddb 100644
--- a/voltha/adapters/asfvolt16_olt/asfvolt16_olt.py
+++ b/voltha/adapters/asfvolt16_olt/asfvolt16_olt.py
@@ -20,7 +20,7 @@
 
 import structlog
 from voltha.adapters.iadapter import OltAdapter
-from voltha.adapters.asfvolt16.asfvolt16_device_handler import Asfvolt16Handler
+from voltha.adapters.asfvolt16_olt.asfvolt16_device_handler import Asfvolt16Handler
 
 log = structlog.get_logger()