dm: sunxi: Support driver model for Ethernet

Adjust the Ethernet initialisation code to support driver model.
It is no-longer necessary to call designware_initialize(). The device will
be probed when it is used. The PHY type and GMAC base will come from the
device tree.
Signed-off-by: NSimon Glass <sjg@chromium.org>

board/sunxi/gmac.c

@@ -80,11 +80,15 @@ int sunxi_gmac_initialize(bd_t *bis)
 		sunxi_gpio_set_cfgpin(pin, SUN6I_GPA_GMAC);
 #endif
 
-#ifdef CONFIG_RGMII
+#ifdef CONFIG_DM_ETH
+	return 0;
+#else
+# ifdef CONFIG_RGMII
 	return designware_initialize(SUNXI_GMAC_BASE, PHY_INTERFACE_MODE_RGMII);
-#elif defined CONFIG_GMII
+# elif defined CONFIG_GMII
 	return designware_initialize(SUNXI_GMAC_BASE, PHY_INTERFACE_MODE_GMII);
-#else
+# else
 	return designware_initialize(SUNXI_GMAC_BASE, PHY_INTERFACE_MODE_MII);
+# endif
 #endif
 }