RDMA/rxe: Replace include statement

rxe_queue.h currently includes <uapi/rdma/rdma_user_rxe.h> for a
definition of struct rxe_queue_buf. But it is only used as a pointer so
the definition is not needed.

This patch replaces the include statement with the declaration

     struct rxe_queue_buf;

Link: https://lore.kernel.org/r/20220630190425.2251-5-rpearsonhpe@gmail.comReported-by: Frank Zago <frank.zago@hpe.com>
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe_queue.h

@@ -7,9 +7,6 @@
 #ifndef RXE_QUEUE_H
 #define RXE_QUEUE_H
 
-/* for definition of shared struct rxe_queue_buf */
-#include <uapi/rdma/rdma_user_rxe.h>
-
 /* Implements a simple circular buffer that is shared between user
  * and the driver and can be resized. The requested element size is
  * rounded up to a power of 2 and the number of elements in the buffer
@@ -53,6 +50,8 @@ enum queue_type {
 	QUEUE_TYPE_FROM_DRIVER,
 };
 
+struct rxe_queue_buf;
+
 struct rxe_queue {
 	struct rxe_dev		*rxe;
 	struct rxe_queue_buf	*buf;