patman: Drop references to __future__

We don't need these now that the tools using Python 3. Drop them.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/entry.py

@@ -4,8 +4,6 @@
 # Base class for all entries
 #
 
-from __future__ import print_function
-
 from collections import namedtuple
 import importlib
 import os