USB: disable rust bindings from the build for now

The rust USB bindings as submitted are a good start, but they don't
really seem to be correct in a number of minor places, so just disable
them from the build entirely at this point in time.  When they are ready
to be re-enabled, this commit can be reverted.

Acked-by: Daniel Almeida <daniel.almeida@collabora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

rust/bindings/bindings_helper.h

@@ -74,7 +74,6 @@
 #include <linux/slab.h>
 #include <linux/task_work.h>
 #include <linux/tracepoint.h>
-#include <linux/usb.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
 #include <linux/xarray.h>

rust/helpers/helpers.c

@@ -48,7 +48,6 @@
 #include "task.c"
 #include "time.c"
 #include "uaccess.c"
-#include "usb.c"
 #include "vmalloc.c"
 #include "wait.c"
 #include "workqueue.c"

rust/kernel/lib.rs

@@ -127,8 +127,6 @@ pub mod time;
 pub mod tracepoint;
 pub mod transmute;
 pub mod types;
-#[cfg(CONFIG_USB = "y")]
-pub mod usb;
 pub mod uaccess;
 pub mod workqueue;
 pub mod xarray;