patman: Add a -m option to avoid copying the maintainers

The get_maintainers script is a useful default, but sometimes is copies
too many people, or takes a long time to run.

Add an option to disable it and update the README.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/patman/series.py b/tools/patman/series.py
index 88c0d87..b67f870 100644
--- a/tools/patman/series.py
+++ b/tools/patman/series.py
@@ -201,7 +201,8 @@
             str = 'Change log exists, but no version is set'
             print col.Color(col.RED, str)
 
-    def MakeCcFile(self, process_tags, cover_fname, raise_on_error):
+    def MakeCcFile(self, process_tags, cover_fname, raise_on_error,
+                   add_maintainers):
         """Make a cc file for us to use for per-commit Cc automation
 
         Also stores in self._generated_cc to make ShowActions() faster.
@@ -211,6 +212,7 @@
             cover_fname: If non-None the name of the cover letter.
             raise_on_error: True to raise an error when an alias fails to match,
                 False to just print a message.
+            add_maintainers: Call the get_maintainers to CC maintainers
         Return:
             Filename of temp file created
         """
@@ -225,7 +227,8 @@
                                                raise_on_error=raise_on_error)
             list += gitutil.BuildEmailList(commit.cc_list,
                                            raise_on_error=raise_on_error)
-            list += get_maintainer.GetMaintainer(commit.patch)
+	    if add_maintainers:
+                list += get_maintainer.GetMaintainer(commit.patch)
             all_ccs += list
             print >>fd, commit.patch, ', '.join(list)
             self._generated_cc[commit.patch] = list