rust_binder: Implement BINDER_DEBUG_DEATH_NOTIFICATION

for death notification allocation failures

This adds dynamic debug logs for:
- Memory allocation failures when registering process death
  notifications due to out-of-memory (OOM) conditions.

Change-Id: I2c7c90dc02808862d0709a95542bb79dd4cd7064
Signed-off-by: Jahnavi MN <jahnavimn@google.com>

Author: jahnavi-MN496

drivers/android/binder/process.rs

@@ -1267,6 +1267,10 @@ impl Process {
         // Queue BR_ERROR if we can't allocate memory for the death notification.
         let death = UniqueArc::new_uninit(GFP_KERNEL).inspect_err(|_| {
             thread.push_return_work(BR_ERROR);
+            binder_debug!(
+                DeathNotification,
+                "BC_REQUEST_DEATH_NOTIFICATION failed"
+            );
         })?;
         let mut refs = self.node_refs.lock();
         let Some(info) = refs.by_handle.get_mut(&handle) else {