Revert "rust: remove params from module macro example"

This reverts commit 1984345.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

rust/macros/lib.rs

@@ -36,6 +36,18 @@ use proc_macro::TokenStream;
 ///     author: "Rust for Linux Contributors",
 ///     description: "My very own kernel module!",
 ///     license: "GPL",
+///     params: {
+///        my_i32: i32 {
+///            default: 42,
+///            permissions: 0o000,
+///            description: "Example of i32",
+///        },
+///        writeable_i32: i32 {
+///            default: 42,
+///            permissions: 0o644,
+///            description: "Example of i32",
+///        },
+///    },
 /// }
 ///
 /// struct MyModule;