patman: Convert camel case in get_maintainer.py

Convert this file to snake case and update all files which use it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/patman/series.py b/tools/patman/series.py
index 98b4c9c..7f5e600 100644
--- a/tools/patman/series.py
+++ b/tools/patman/series.py
@@ -269,7 +269,7 @@
                 cc += add_maintainers
             elif add_maintainers:
                 dir_list = [os.path.join(gitutil.GetTopLevel(), 'scripts')]
-                cc += get_maintainer.GetMaintainer(dir_list, commit.patch)
+                cc += get_maintainer.get_maintainer(dir_list, commit.patch)
             for x in set(cc) & set(settings.bounces):
                 print(col.Color(col.YELLOW, 'Skipping "%s"' % x))
             cc = list(set(cc) - set(settings.bounces))