Port #[automatically_derived] to the new attribute parsing infrastructure

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

compiler/rustc_parse/src/validate_attr.rs

@@ -316,6 +316,7 @@ pub fn check_builtin_meta_item(
                 | sym::rustc_layout_scalar_valid_range_start
                 | sym::rustc_layout_scalar_valid_range_end
                 | sym::no_implicit_prelude
+                | sym::automatically_derived
         ) {
             return;
         }