rust: kasan: Rust does not support KHWASAN

Rust does not yet have support for software tags. Prevent RUST from
being selected if KASAN_SW_TAGS is enabled.

Signed-off-by: Matthew Maurer <mmaurer@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Link: https://lore.kernel.org/r/20240820194910.187826-3-mmaurer@google.com


Signed-off-by: Miguel Ojeda <ojeda@kernel.org>