[psram] Make schema extractable with per-variant options (#16949)

Co-authored-by: J. Nick Koston <nick@koston.org>

script/build_language_schema.py

@@ -951,6 +951,15 @@ def convert(schema, config_var, path):
         elif schema_type == "enum":
             config_var[S_TYPE] = "enum"
             config_var["values"] = dict.fromkeys(list(data.keys()))
+        elif schema_type == "variant_enum":
+            # Per-variant enum (e.g. psram mode/speed): each value carries the
+            # list of variants that accept it so clients can filter to the
+            # user's selected variant. Additive to the plain enum format —
+            # consumers that ignore the metadata still see every option.
+            config_var[S_TYPE] = "enum"
+            config_var["values"] = {
+                value: {"variants": variants} for value, variants in data.items()
+            }
         elif schema_type == "maybe":
             # maybe_simple_value: either a scalar shorthand (mapped to the key in
             # data[1]) or the full wrapped schema. The wrapped schema is usually a