rust: fmt: route {:p} through HashedPtr to prevent address leaks

Define a custom `kernel::fmt::Pointer` trait and `HashedPtr` wrapper
so that `{:p}` formatting uses the kernel's `%p` hashed format instead
of printing raw pointer values, preventing kernel address space leaks.

Signed-off-by: Ke Sun <sunke@kylinos.cn>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260810-hashedptr-v15-2-eafd27d36476@kylinos.cn
[ Fixed KUnit failure when the CRNG is not ready. Then, as suggested,
  replaced the `scnprintf` comment (with v16's), changed width to 100,
  replaced cast with `without_provenance`. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

0 files changed, 0 insertions, 0 deletions