phy: add driver for Intel XWAY PHY

Add a driver for the Intel XWAY GbE PHY:
 - configure RGMII using dt phy-mode and standard delay properties
 - use genphy_config

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 9087663..92143cf 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -556,6 +556,9 @@
 #ifdef CONFIG_PHY_XILINX
 	phy_xilinx_init();
 #endif
+#ifdef CONFIG_PHY_XWAY
+	phy_xway_init();
+#endif
 #ifdef CONFIG_PHY_MSCC
 	phy_mscc_init();
 #endif