utils: codegen: gen-controls.py: Convert to jinja2 templates

Jinja2 templates help separate the logic related to the template from
the generation of the data. The python code becomes much clearer as a
result.

As an added bonus, we can use a single template file for both controls
and properties.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

include/libcamera/meson.build

@@ -80,7 +80,7 @@ foreach mode, entry : controls_map
         properties_files_names += files_list
     endif
 
-    template_file = files(outfile + '.in')
+    template_file = files('control_ids.h.in')
     ranges_file = files('../../src/libcamera/control_ranges.yaml')
     control_headers += custom_target(header + '_h',
                                      input : input_files,