patman: 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/patman/gitutil.py b/tools/patman/gitutil.py
index 7650b51..11aeb73 100644
--- a/tools/patman/gitutil.py
+++ b/tools/patman/gitutil.py
@@ -397,11 +397,11 @@
         git_config_to = command.Output('git', 'config', 'sendemail.to',
                                        raise_on_error=False)
         if not git_config_to:
-            print ("No recipient.\n"
-                   "Please add something like this to a commit\n"
-                   "Series-to: Fred Bloggs <f.blogs@napier.co.nz>\n"
-                   "Or do something like this\n"
-                   "git config sendemail.to u-boot@lists.denx.de")
+            print("No recipient.\n"
+                  "Please add something like this to a commit\n"
+                  "Series-to: Fred Bloggs <f.blogs@napier.co.nz>\n"
+                  "Or do something like this\n"
+                  "git config sendemail.to u-boot@lists.denx.de")
             return
     cc = BuildEmailList(list(set(series.get('cc')) - set(series.get('to'))),
                         '--cc', alias, raise_on_error)