spi: dw: migrate to generic queue infrastructure

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/spi/spi-dw.h

@@ -104,14 +104,6 @@ struct dw_spi {
 	u16			bus_num;
 	u16			num_cs;		/* supported slave numbers */
 
-	/* Driver message queue */
-	struct workqueue_struct	*workqueue;
-	struct work_struct	pump_messages;
-	spinlock_t		lock;
-	struct list_head	queue;
-	int			busy;
-	int			run;
-
 	/* Message Transfer pump */
 	struct tasklet_struct	pump_transfers;