[SCSI] mvsas: Add support for interrupt tasklet

Add support for interrupt tasklet, which will improve performance.
Correct spelling of "20011"

[jejb: simplified ifdefs and fixed unused variable problem]
Signed-off-by: Xiangliang Yu <yuxiangl@marvell.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/mvsas/mv_sas.h b/drivers/scsi/mvsas/mv_sas.h
index 25fae4f..44d7885 100644
--- a/drivers/scsi/mvsas/mv_sas.h
+++ b/drivers/scsi/mvsas/mv_sas.h
@@ -420,6 +420,7 @@
 	u8 scan_finished;
 	u8 reserve;
 	struct mvs_info *mvi[2];
+	struct tasklet_struct mv_tasklet;
 };
 
 struct mvs_wq {