r6040: Move the RDC driver

Move the RDC driver into drivers/net/ethernet/rdc/ and make the
necessary Kconfig and Makefile changes.

CC: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index 68a31b9..78e567f 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -83,6 +83,7 @@
 source "drivers/net/ethernet/qlogic/Kconfig"
 source "drivers/net/ethernet/racal/Kconfig"
 source "drivers/net/ethernet/realtek/Kconfig"
+source "drivers/net/ethernet/rdc/Kconfig"
 
 config S6GMAC
 	tristate "S6105 GMAC ethernet support"