stmmac: tidy-up stmmac_priv structure

This patch tidies-up the stmmac_priv structure
that had many fileds alredy defined in the
plat_stmmacenet_data structure.

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_ethtool.c b/drivers/net/stmmac/stmmac_ethtool.c
index 6d65482..f2695fd 100644
--- a/drivers/net/stmmac/stmmac_ethtool.c
+++ b/drivers/net/stmmac/stmmac_ethtool.c
@@ -94,7 +94,7 @@
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
 
-	if (!priv->is_gmac)
+	if (!priv->plat->has_gmac)
 		strcpy(info->driver, MAC100_ETHTOOL_NAME);
 	else
 		strcpy(info->driver, GMAC_ETHTOOL_NAME);
@@ -176,7 +176,7 @@
 
 	memset(reg_space, 0x0, REG_SPACE_SIZE);
 
-	if (!priv->is_gmac) {
+	if (!priv->plat->has_gmac) {
 		/* MAC registers */
 		for (i = 0; i < 12; i++)
 			reg_space[i] = readl(priv->ioaddr + (i * 4));