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/image.py

@@ -5,8 +5,6 @@
 # Class for an image, the output of binman
 #
 
-from __future__ import print_function
-
 from collections import OrderedDict
 import fnmatch
 from operator import attrgetter