stmmac: make ioaddr 'void __iomem *' rather than unsigned long

This avoids unnecessary casting and adds the ioaddr in the
private structure.
This patch also removes many warning when compile the driver.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/stmmac/stmmac.h b/drivers/net/stmmac/stmmac.h
index ebebc64..cca53db 100644
--- a/drivers/net/stmmac/stmmac.h
+++ b/drivers/net/stmmac/stmmac.h
@@ -54,6 +54,7 @@
 	unsigned int dma_buf_sz;
 	struct device *device;
 	struct mac_device_info *hw;
+	void __iomem *ioaddr;
 
 	struct stmmac_extra_stats xstats;
 	struct napi_struct napi;
@@ -65,7 +66,7 @@
 	int phy_mask;
 	int (*phy_reset) (void *priv);
 	void (*fix_mac_speed) (void *priv, unsigned int speed);
-	void (*bus_setup)(unsigned long ioaddr);
+	void (*bus_setup)(void __iomem *ioaddr);
 	void *bsp_priv;
 
 	int phy_irq;