IB/rxe: avoid export symbols

The functions rxe_set_mtu, rxe_add and rxe_remove are only used in their
own module. So it is not necessary to export them.

CC: Srinivas Eeda <srinivas.eeda@oracle.com>
CC: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/sw/rxe/rxe.c

@@ -306,7 +306,6 @@ int rxe_set_mtu(struct rxe_dev *rxe, unsigned int ndev_mtu)
 
 	return 0;
 }
-EXPORT_SYMBOL(rxe_set_mtu);
 
 /* called by ifc layer to create new rxe device.
  * The caller should allocate memory for rxe by calling ib_alloc_device.
@@ -335,7 +334,6 @@ int rxe_add(struct rxe_dev *rxe, unsigned int mtu)
 	rxe_dev_put(rxe);
 	return err;
 }
-EXPORT_SYMBOL(rxe_add);
 
 /* called by the ifc layer to remove a device */
 void rxe_remove(struct rxe_dev *rxe)
@@ -344,7 +342,6 @@ void rxe_remove(struct rxe_dev *rxe)
 
 	rxe_dev_put(rxe);
 }
-EXPORT_SYMBOL(rxe_remove);
 
 static int __init rxe_module_init(void)
 {