drivers/net/ethernet: Add ethernet dir and config option

This is the initial patch to organize the drivers/net directory
structure and networking device driver config options.  This patch
does the following:
  - add drivers/net/ethernet/Kconfig
  - integrate the new files into the existing config

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
new file mode 100644
index 0000000..d59e4f2
--- /dev/null
+++ b/drivers/net/ethernet/Kconfig
@@ -0,0 +1,14 @@
+#
+# Ethernet LAN device configuration
+#
+
+menuconfig ETHERNET
+	bool "Ethernet driver support"
+	depends on NET
+	default y
+	---help---
+	  This section contains all the Ethernet device drivers.
+
+if ETHERNET
+
+endif # ETHERNET