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/Kconfig b/drivers/net/phy/Kconfig
index 52ce08b..86e6981 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -321,6 +321,11 @@
 	  as bridge between MAC connected over GMII and external phy that
 	  is connected over RGMII interface.
 
+config PHY_XWAY
+	bool "Intel XWAY PHY support"
+	help
+	  This adds support for the Intel XWAY (formerly Lantiq) Gbe PHYs.
+
 config PHY_ETHERNET_ID
 	bool "Read ethernet PHY id"
 	depends on DM_GPIO