net/at91_ether: use macb access functions

Use macb read/write funtions and remove the old at91_ether ones.
Signed-off-by: Joachim Eastwood <manabian@gmail.com>

drivers/net/ethernet/cadence/at91_ether.h

@@ -88,7 +88,7 @@ struct at91_private
 	struct macb_platform_data board_data;	/* board-specific
 						 * configuration (shared with
 						 * macb for common data */
-	void __iomem *emac_base;		/* base register address */
+	void __iomem *regs;			/* base register address */
 	struct clk *ether_clk;			/* clock */
 
 	/* PHY */