vduse: Remove include of rwlock.h

rwlock.h should not be included directly. Instead linux/splinlock.h
should be included. Including it directly will break the RT build.

Remove the rwlock.h include.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Michael S. Tsirkin <mst@redhat.com>

drivers/vdpa/vdpa_user/iova_domain.h

@@ -14,7 +14,6 @@
 #include <linux/iova.h>
 #include <linux/dma-mapping.h>
 #include <linux/vhost_iotlb.h>
-#include <linux/rwlock.h>
 
 #define IOVA_START_PFN 1