[SCSI] tgt: fix undefined flush_dcache_page() problem

drivers/scsi/scsi_tgt_if.c: In function 'tgt_uspace_send_event':
drivers/scsi/scsi_tgt_if.c:88: warning: implicit declaration of function 'flush_dcache_page'
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_tgt_if.c

@@ -29,6 +29,8 @@
 #include <scsi/scsi_tgt.h>
 #include <scsi/scsi_tgt_if.h>
 
+#include <asm/cacheflush.h>
+
 #include "scsi_tgt_priv.h"
 
 struct tgt_ring {