Rust fixes for v6.12

Toolchain and infrastructure:

 - Fix/improve a couple 'depends on' on the newly added CFI/KASAN
   suppport to avoid build errors/warnings.

 - Fix ARCH_SLAB_MINALIGN multiple definition error for RISC-V under
   !CONFIG_MMU.

 - Clean upcoming (Rust 1.83.0) Clippy warnings.

'kernel' crate:

 - 'sync' module: fix soundness issue by requiring 'T: Sync' for
   'LockedBy::access'; and fix helpers build error under PREEMPT_RT.

 - Fix trivial sorting issue ('rustfmtcheck') on the v6.12 Rust merge.
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