py: Rename 'efd' to 'event_fd'

Perhaps it's better to have a more descriptive name here. I also
considered just renaming 'efd' to 'fd', but 'event_fd' won.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

test/py/unittests.py

@@ -269,7 +269,7 @@ class SimpleCaptureMethods(CameraTesterBase):
         gc.collect()
 
         sel = selectors.DefaultSelector()
-        sel.register(cm.efd, selectors.EVENT_READ)
+        sel.register(cm.event_fd, selectors.EVENT_READ)
 
         reqs = []