amd-xgbe: Configuration and build support

This patch provides the Kconfig and Makefile changes needed
to configure and build the AMD 10GbE platform driver and the
AMD 10GbE phylib driver.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 07d2402..7dc3d5b 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -33,3 +33,4 @@
 obj-$(CONFIG_MDIO_BUS_MUX_MMIOREG) += mdio-mux-mmioreg.o
 obj-$(CONFIG_MDIO_SUN4I)	+= mdio-sun4i.o
 obj-$(CONFIG_MDIO_MOXART)	+= mdio-moxart.o
+obj-$(CONFIG_AMD_XGBE_PHY)	+= amd-xgbe-phy.o