doc: extensions: only generate list of hw features in HTML build

Only HTML builds actually display board documentation so there is no
point in generating the list of hardware features in other builds.

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

doc/_extensions/zephyr/domain/__init__.py

@@ -1126,7 +1126,11 @@ def install_static_assets_as_needed(
 
 
 def load_board_catalog_into_domain(app: Sphinx) -> None:
-    board_catalog = get_catalog(generate_hw_features=app.config.zephyr_generate_hw_features)
+    board_catalog = get_catalog(
+        generate_hw_features=(
+            app.builder.format == "html" and app.config.zephyr_generate_hw_features
+        )
+    )
     app.env.domaindata["zephyr"]["boards"] = board_catalog["boards"]
     app.env.domaindata["zephyr"]["vendors"] = board_catalog["vendors"]
     app.env.domaindata["zephyr"]["socs"] = board_catalog["socs"]