intel: Move the Intel wired LAN drivers

Moves the Intel wired LAN drivers into drivers/net/ethernet/intel/ and
the necessary Kconfig and Makefile changes.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index 69d6403..a2fd385 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -16,5 +16,6 @@
 source "drivers/net/ethernet/amd/Kconfig"
 source "drivers/net/ethernet/broadcom/Kconfig"
 source "drivers/net/ethernet/chelsio/Kconfig"
+source "drivers/net/ethernet/intel/Kconfig"
 
 endif # ETHERNET