ANDROID: rust_binder: add back tracepoints

Tracepoints were removed from the the vendor module version of Rust
Binder as it required either fixing b/394605825 or hard-coding the
tracepoint declarations as created by bindgen.

As we are moving Rust Binder back into common/, this no longer depends
on invoking bindgen from the DDK. Thus, revert these changes.

Bug: 394605825
Bug: 388786466
Change-Id: I81fe5b2b4c92826c6478606cd78c8fccd8a5c7e4
Signed-off-by: Alice Ryhl <aliceryhl@google.com>

drivers/android/binder/process.rs

@@ -383,6 +383,13 @@ impl ProcessNodeRefs {
     }
 }
 
+use core::mem::offset_of;
+use kernel::bindings::rb_process_layout;
+pub(crate) const PROCESS_LAYOUT: rb_process_layout = rb_process_layout {
+    arc_offset: Arc::<Process>::DATA_OFFSET,
+    task: offset_of!(Process, task),
+};
+
 /// A process using binder.
 ///
 /// Strictly speaking, there can be multiple of these per process. There is one for each binder fd