target: linux: config: Newer kernels have CONFIG_WLAN_VENDOR_ATH

Kernel config symbol ATH_CARDS was renamed in kernel commit
b5c9b4f91a6f9 ("ath: unify Kconfig with other vendors").

Signed-off-by: Phil Sutter <phil@nwl.cc>

target/linux/config/Config.in.wireless

@@ -42,8 +42,12 @@ config ADK_LINUX_KERNEL_WLAN_VENDOR_BROADCOM
 config ADK_LINUX_KERNEL_WLAN_VENDOR_RALINK
 	bool
 
+config ADK_LINUX_KERNEL_WLAN_VENDOR_ATH
+	bool
+
 config ADK_LINUX_KERNEL_ATH_CARDS
 	bool
+	select ADK_LINUX_KERNEL_WLAN_VENDOR_ATH
 
 config ADK_LINUX_KERNEL_RTL_CARDS
 	bool