ethernet: MediaTek: add ethernet driver for MediaTek ARM-based SoCs

This patch adds ethernet support for Mediatek ARM-based SoCs, including
a minimum setup of the integrated switch.

Cc: Joe Hershberger <joe.hershberger@ni.com>
Tested-By: "Frank Wunderlich" <frank-w@public-files.de>
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 0dbfa03..ee7f3e7 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -74,3 +74,4 @@
 obj-$(CONFIG_FSL_PFE) += pfe_eth/
 obj-$(CONFIG_SNI_AVE) += sni_ave.o
 obj-y += ti/
+obj-$(CONFIG_MEDIATEK_ETH) += mtk_eth.o