rust: binder: use strict provenance APIs

Replace the pointer-to-integer conversions in the Binder Rust driver
with calls to the strict provenance APIs.

The strict provenance APIs were stabilized in Rust 1.84.0 [1]. Since
commit f32fb9c58a ("rust: bump Rust minimum supported version to
1.85.0 (Debian Trixie)"), the minimum supported Rust version is 1.85.0,
so no polyfills are needed.

Link: https://blog.rust-lang.org/2025/01/09/Rust-1.84.0.html#strict-provenance-apis [1]
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Assisted-by: Codex:gpt-5
Signed-off-by: Tamir Duberstein <tamird@kernel.org>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260526-binder-strict-provenance-v2-1-a41d89c29bc5@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/android/binder/node.rs

@@ -321,7 +321,7 @@ pub(crate) unsafe fn remove_node_info(
     /// An id that is unique across all binder nodes on the system. Used as the key in the
     /// `by_node` map.
     pub(crate) fn global_id(&self) -> usize {
-        self as *const Node as usize
+        (self as *const Node).addr()
     }
 
     pub(crate) fn get_id(&self) -> (u64, u64) {

drivers/android/binder/rust_binder_main.rs

@@ -511,7 +511,7 @@ unsafe impl<T> Sync for AssertSync<T> {}
     _: *mut kernel::ffi::c_void,
 ) -> kernel::ffi::c_int {
     // SAFETY: Accessing the private field of `seq_file` is okay.
-    let pid = (unsafe { (*ptr).private }) as usize as Pid;
+    let pid = unsafe { (*ptr).private }.addr() as Pid;
     // SAFETY: The caller ensures that the pointer is valid and exclusive for the duration in which
     // this method is called.
     let m = unsafe { SeqFile::from_raw(ptr) };