patman: Rename test_basic() in test_checkpatch

This currently has the same name as a test in func_test.py so it isn't
possible to select one or the other with 'patman test test_basic': both
are executed.

Rename this one to avoid confusion.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/patman/test_checkpatch.py

@@ -137,7 +137,7 @@ Signed-off-by: Simon Glass <sjg@chromium.org>
 class TestPatch(unittest.TestCase):
     """Test the u_boot_line() function in checkpatch.pl"""
 
-    def test_basic(self):
+    def test_filter(self):
         """Test basic filter operation"""
         data='''