net: add Socionext AVE ethernet driver support

Add driver for Socionext AVE ethernet controller that includes MAC and
MDIO bus supporting RGMII/RMII modes.
The driver behaves the ethernet driver model (DM_ETH) with devicetree.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 584bfdf..058dd00 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -70,3 +70,4 @@
 obj-$(CONFIG_PIC32_ETH) += pic32_mdio.o pic32_eth.o
 obj-$(CONFIG_DWC_ETH_QOS) += dwc_eth_qos.o
 obj-$(CONFIG_FSL_PFE) += pfe_eth/
+obj-$(CONFIG_SNI_AVE) += sni_ave.o