ath: fix selecting the module individually (#19162)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 44750

package/kernel/mac80211/patches/070-ath_common_config.patch

+--- a/drivers/net/wireless/ath/Kconfig
++++ b/drivers/net/wireless/ath/Kconfig
+@@ -6,6 +6,7 @@ menuconfig ATH_CARDS
+ 	tristate "Atheros Wireless Cards"
+ 	depends on m
+ 	depends on CFG80211 && (!UML || BROKEN)
++	select ATH_COMMON
+ 	---help---
+ 	  This will enable the support for the Atheros wireless drivers.
+ 	  ath5k, ath9k, ath9k_htc and ar9170 drivers share some common code, this option