rust: chardev, qdev: add bindings to qdev_prop_set_chr

Because the argument to the function is an Owned<Chardev>, this also
adds an ObjectType implementation to Chardev.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

rust/qemu-api/src/lib.rs

@@ -18,6 +18,7 @@ pub mod bitops;
 pub mod c_str;
 pub mod callbacks;
 pub mod cell;
+pub mod chardev;
 pub mod irq;
 pub mod memory;
 pub mod module;