rust: depend on !RANDSTRUCT

Clang 15 will support structure layout randomization, and the kernel
has reorganized the Kconfig options in preparation, see commit
595b893 ("randstruct: Reorganize Kconfigs and attribute macros").

Thus depend ourselves on `!RANDSTRUCT` until we figure out a way
to handle it in `bindgen` (or go through a C function etc.). Some
of the Rust code we have in the `kernel` crate does not support it
in any case.

Link: https://lore.kernel.org/lkml/[email protected]/
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

init/Kconfig

@@ -1916,6 +1916,7 @@ config RUST
 	depends on RUST_IS_AVAILABLE
 	depends on !MODVERSIONS
 	depends on !GCC_PLUGINS
+	depends on !RANDSTRUCT
 	depends on !DEBUG_INFO_BTF
 	select CONSTRUCTORS
 	help