clang-tidy:scripts change filenames to [ch]pp.mako

Openbmc typically name mako files as "foo.type.mako" instead of
"foo.mako.type" because many tools mistakenly identify the file
type as "type" rather than "mako". Currently, Meson is incorrectly
including these files in the `clang-tidy` invocation, causing errors.
Rename the files both to fit convention and to avoid the issues.

Change-Id: Ib97f494bd79232d761afd5f740932fe1739a6c4e
Signed-off-by: Jayanth Othayoth <ojayanth@gmail.com>
diff --git a/scripts/extra-properties.py b/scripts/extra-properties.py
index 465f95c..fdb8f9f 100755
--- a/scripts/extra-properties.py
+++ b/scripts/extra-properties.py
@@ -25,7 +25,7 @@
         yamlDict = yaml.safe_load(fd)
 
         # Render the mako template
-        template = os.path.join(script_dir, "extra-properties.mako.cpp")
+        template = os.path.join(script_dir, "extra-properties.cpp.mako")
         t = Template(filename=template)
         with open("extra-properties-gen.cpp", "w") as fd:
             fd.write(t.render(dict=yamlDict))