extmod/asyncio: Pass globals in __import__ call.

`globals()` needs to be provided in case `__import__` is a Python function.

extmod/asyncio/__init__.py

@@ -26,6 +26,6 @@ def __getattr__(attr):
     mod = _attrs.get(attr, None)
     if mod is None:
         raise AttributeError(attr)
-    value = getattr(__import__(mod, None, None, True, 1), attr)
+    value = getattr(__import__(mod, globals(), None, True, 1), attr)
     globals()[attr] = value
     return value