rust: sync: move lockdep types to rust/kernel/sync/lockdep.rs

The lockdep types are currently stored directly in rust/kernel/sync.rs,
but there are starting to be too many of them to keep them in that file.
Thus, move them to a submodule. The new module is listed under LOCKING
PRIMITIVES in the MAINTAINERS file.

For commonly used lockdep logic it's useful to keep re-exports in
kernel::sync, and this also avoids the need to update any users.

Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Boqun Feng <boqun@kernel.org>
Reviewed-by: Carlos Llamas <cmllamas@google.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20261007-pr-ratelimited-v6-1-f14accd4ea3b@google.com
[ Used the "kernel vertical" imports style. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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