rust: bindings: allow any number of params

rust: bindings: allow any number of params

We are going to be adding more parameters, and this makes
rust unhappy:
    Functions with lots of parameters are considered bad style and reduce
    readability (“what does the 5th parameter mean?”). Consider grouping
    some parameters into a new type.

Specifically:

error: this function has too many arguments (8/7)
    --> /builds/mstredhat/qemu/build/rust/qemu-api/rust-qemu-api-tests.p/structured/bindings.inc.rs:3840:5
     |
3840 | /     pub fn new_bitfield_1(
3841 | |         secure: std::os::raw::c_uint,
3842 | |         space: std::os::raw::c_uint,
3843 | |         user: std::os::raw::c_uint,
...    |
3848 | |         address_type: std::os::raw::c_uint,
3849 | |     ) -> __BindgenBitfieldUnit<[u8; 4usize]> {
     | |____________________________________________^
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
     = note: `-D clippy::too-many-arguments` implied by `-D warnings`
     = help: to override `-D warnings` add `#[allow(clippy::too_many_arguments)]`

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <e41344bd22248b0883752ef7a7c459090a3d9cfc.1752560127.git.mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>