net: Add ag7xxx driver for Atheros MIPS

Add ethernet driver for the AR933x and AR934x Atheros MIPS machines.
The driver could be easily extended to other WiSoCs.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Wills Wang <wills.wang@live.com>
[fixed Kconfig dependency]
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 91b7690..c1cb689 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -46,6 +46,15 @@
 
 if NETDEVICES
 
+config AG7XXX
+	bool "Atheros AG7xxx Ethernet MAC support"
+	depends on DM_ETH && ARCH_ATH79
+	select PHYLIB
+	help
+	  This driver supports the Atheros AG7xxx Ethernet MAC. This MAC is
+	  present in the Atheros AR7xxx, AR9xxx and QCA9xxx MIPS chips.
+
+
 config ALTERA_TSE
 	bool "Altera Triple-Speed Ethernet MAC support"
 	depends on DM_ETH