dwc_eth_qos: Add the synopsys folder to the build system.

Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index f3bb178..05aa759 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -167,6 +167,7 @@
 source "drivers/net/ethernet/smsc/Kconfig"
 source "drivers/net/ethernet/stmicro/Kconfig"
 source "drivers/net/ethernet/sun/Kconfig"
+source "drivers/net/ethernet/synopsys/Kconfig"
 source "drivers/net/ethernet/tehuti/Kconfig"
 source "drivers/net/ethernet/ti/Kconfig"
 source "drivers/net/ethernet/tile/Kconfig"