nuvoton: Move the Nuvoton driver

Move the Nuvoton driver into drivers/net/ethernet/nuvoton/ and
make the necessary Kconfig and Makefile changes.

CC: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/nuvoton/Makefile b/drivers/net/ethernet/nuvoton/Makefile
new file mode 100644
index 0000000..171aa04
--- /dev/null
+++ b/drivers/net/ethernet/nuvoton/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the Nuvoton network device drivers.
+#
+
+obj-$(CONFIG_W90P910_ETH) += w90p910_ether.o