binman: Convert print statements to Python 3

Update all print statements to be functions, as required by Python 3.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/control.py b/tools/binman/control.py
index b32e4e1..8f7f906 100644
--- a/tools/binman/control.py
+++ b/tools/binman/control.py
@@ -5,6 +5,8 @@
 # Creates binary images from input files controlled by a description
 #
 
+from __future__ import print_function
+
 from collections import OrderedDict
 import os
 import sys
@@ -134,7 +136,7 @@
                         del images[name]
                         skip.append(name)
                 if skip and options.verbosity >= 2:
-                    print 'Skipping images: %s' % ', '.join(skip)
+                    print('Skipping images: %s' % ', '.join(skip))
 
             state.Prepare(images, dtb)
 
@@ -170,7 +172,7 @@
                 except Exception as e:
                     if options.map:
                         fname = image.WriteMap()
-                        print "Wrote map file '%s' to show errors"  % fname
+                        print("Wrote map file '%s' to show errors"  % fname)
                     raise
                 image.SetImagePos()
                 if options.update_fdt: