rust: Make AttPermissions compatible with libbitflags 2.2.1

For compatibility with the new version of libbitflags (2.2.1), implement
Copy, Clone, Debug, PartialEq, Eq for AttPermissions.

Bug: 261439617
Test: Build
Change-Id: Ief378cdd5c9c63f9a01b37a9ef080b90eaee7631
Ignore-AOSP-First: This is a cherry-pick from AOSP because changes to
Rust crates are not automerged from AOSP.

Change-Id: Ib00d6cf4c55ce69481aab277ae86365aac3eaa8f