scsi: megaraid_sas: Update structures for HOST_DEVICE_LIST DCMD

Add padding to make the structure variables in MR_HOST_DEVICE_LIST_ENTRY
64-bit aligned.  Also, add reserved fields to MR_HOST_DEVICE_LIST for
future firmware usage.
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/megaraid/megaraid_sas.h

@@ -807,13 +807,14 @@ struct MR_HOST_DEVICE_LIST_ENTRY {
 	} flags;
 	u8 scsi_type;
 	__le16 target_id;
-	u8 reserved[2];
+	u8 reserved[4];
 	__le64 sas_addr[2];
 } __packed;
 
 struct MR_HOST_DEVICE_LIST {
 	__le32			size;
 	__le32			count;
+	__le32			reserved[2];
 	struct MR_HOST_DEVICE_LIST_ENTRY	host_device_list[1];
 } __packed;