[SCSI] megaraid_sas: Add support to differentiate between iMR vs MR Firmware

Add support to differentiate between iMR(no external memory) and MR(with
external memory) controllers.

Signed-off-by: Sumit Saxena <sumit.saxena@lsi.com>
Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 55a08d8..209fe36 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -1533,6 +1533,7 @@
 	struct mutex reset_mutex;
 	int throttlequeuedepth;
 	u8 mask_interrupts;
+	u8 is_imr;
 };
 
 enum {