MIPS: ath79: add support for the PCI host controller of the AR71XX SoCs

The Atheros AR71XX SoCs have a built-in PCI Host Controller.
This patch adds a driver for that, and modifies the relevant
files in order to allow to register the PCI controller from
board specific setup.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3498/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/ath79/Kconfig b/arch/mips/ath79/Kconfig
index e0fae8f..bc6edad 100644
--- a/arch/mips/ath79/Kconfig
+++ b/arch/mips/ath79/Kconfig
@@ -52,6 +52,7 @@
 config SOC_AR71XX
 	select USB_ARCH_HAS_EHCI
 	select USB_ARCH_HAS_OHCI
+	select HW_HAS_PCI
 	def_bool n
 
 config SOC_AR724X