rust: add `bindings` crate

This crate contains the bindings to the C side of the kernel.

Calling C (in general, FFI) is assumed to be unsafe in Rust
and, in many cases, this is accurate. For instance, virtually
all C functions that take a pointer are unsafe since, typically,
it will be dereferenced at some point (and in most cases there
is no way for the callee to check its validity beforehand).

Since one of the goals of using Rust in the kernel is precisely
to avoid unsafe code in "leaf" kernel modules (e.g. drivers),
these bindings should not be used directly by them.

Instead, these bindings need to be wrapped into safe abstractions.
These abstractions provide a safe API that kernel modules can use.
In this way, unsafe code in kernel modules is minimized.

Reviewed-by: Greg Kroah-Hartman <[email protected]>
Co-developed-by: Alex Gaynor <[email protected]>
Signed-off-by: Alex Gaynor <[email protected]>
Co-developed-by: Finn Behrens <[email protected]>
Signed-off-by: Finn Behrens <[email protected]>
Co-developed-by: Wedson Almeida Filho <[email protected]>
Signed-off-by: Wedson Almeida Filho <[email protected]>
Co-developed-by: Sven Van Asbroeck <[email protected]>
Signed-off-by: Sven Van Asbroeck <[email protected]>
Co-developed-by: Gary Guo <[email protected]>
Signed-off-by: Gary Guo <[email protected]>
Co-developed-by: Maciej Falkowski <[email protected]>
Signed-off-by: Maciej Falkowski <[email protected]>
Co-developed-by: Jiapeng Chong <[email protected]>
Signed-off-by: Jiapeng Chong <[email protected]>
Co-developed-by: Björn Roy Baron <[email protected]>
Signed-off-by: Björn Roy Baron <[email protected]>
Signed-off-by: Miguel Ojeda <[email protected]>

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