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/Makefile b/drivers/net/phy/Makefile
index 9d87eb2..d38e99e 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -34,6 +34,7 @@
 obj-$(CONFIG_PHY_TI_DP83869) += dp83869.o
 obj-$(CONFIG_PHY_XILINX) += xilinx_phy.o
 obj-$(CONFIG_PHY_XILINX_GMII2RGMII) += xilinx_gmii2rgmii.o
+obj-$(CONFIG_PHY_XWAY) += intel_xway.o
 obj-$(CONFIG_PHY_ETHERNET_ID) += ethernet_id.o
 obj-$(CONFIG_PHY_VITESSE) += vitesse.o
 obj-$(CONFIG_PHY_MSCC) += mscc.o