ath79: add new OF only target for QCA MIPS silicon

This target aims to replace ar71xx mid-term. The big part that is still
missing is making the MMIO/AHB wifi work using OF. NAND and mikrotik
subtargets will follow.

Signed-off-by: John Crispin <john@phrozen.org>

target/linux/ath79/patches-4.14/420-net-ar71xx_mac_driver.patch

@@ -0,0 +1,28 @@
+--- a/drivers/net/ethernet/atheros/Kconfig
++++ b/drivers/net/ethernet/atheros/Kconfig
+@@ -5,7 +5,7 @@
+ config NET_VENDOR_ATHEROS
+ 	bool "Atheros devices"
+ 	default y
+-	depends on PCI
++	depends on (PCI || ATH79)
+ 	---help---
+ 	  If you have a network (Ethernet) card belonging to this class, say Y.
+ 
+@@ -78,4 +78,6 @@ config ALX
+ 	  To compile this driver as a module, choose M here.  The module
+ 	  will be called alx.
+ 
++source drivers/net/ethernet/atheros/ag71xx/Kconfig
++
+ endif # NET_VENDOR_ATHEROS
+--- a/drivers/net/ethernet/atheros/Makefile
++++ b/drivers/net/ethernet/atheros/Makefile
+@@ -2,6 +2,7 @@
+ # Makefile for the Atheros network device drivers.
+ #
+ 
++obj-$(CONFIG_AG71XX) += ag71xx/
+ obj-$(CONFIG_ATL1) += atlx/
+ obj-$(CONFIG_ATL2) += atlx/
+ obj-$(CONFIG_ATL1E) += atl1e/