rust: module: add type LocalModule

The `LocalModule` type is the type of the module created by `module!`,
`module_pci_driver!`, `module_platform_driver!`, etc.

Since the exact type of the module is sometimes generated on the fly by
the listed macros, provide an alias.

This is first used by the `module_firmware!` macro.

Acked-by: Miguel Ojeda <ojeda@kernel.org>
Suggested-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20250306222336.23482-2-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

Author: Danilo Krummrich

rust/macros/module.rs

@@ -228,6 +228,10 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
                 kernel::ThisModule::from_ptr(core::ptr::null_mut())
             }};
 
+            /// The `LocalModule` type is the type of the module created by `module!`,
+            /// `module_pci_driver!`, `module_platform_driver!`, etc.
+            type LocalModule = {type_};
+
             impl kernel::ModuleMetadata for {type_} {{
                 const NAME: &'static kernel::str::CStr = kernel::c_str!(\"{name}\");
             }}