acx-mac80211: disable for kernel 4.9+

Due to changes in the PCI subsystem this driver doesn't compile with
kernel 4.9.

Signed-off-by: Mathias Kresin <dev@kresin.me>

package/kernel/acx-mac80211/Makefile

@@ -27,7 +27,7 @@ include $(INCLUDE_DIR)/package.mk
 define KernelPackage/acx-mac80211
   SUBMENU:=Wireless Drivers
   TITLE:=ACX1xx mac80211 driver
-  DEPENDS:=@(PCI_SUPPORT||TARGET_ar7) @!TARGET_cobalt @mipsel +kmod-mac80211
+  DEPENDS:=@(PCI_SUPPORT||TARGET_ar7) @!TARGET_cobalt @mipsel @LINUX_3_18||LINUX_4_4 +kmod-mac80211
   FILES:=$(PKG_BUILD_DIR)/acx-mac80211.ko
   AUTOLOAD:=$(call AutoLoad,50,mac80211 acx-mac80211)
   MAINTAINER:=Florian Fainelli <florian@openwrt.org>