ath9k: set ATH9K_PCI to y by default

Most ath9k devices are PCI/PCIe based, therefor making PCI/PCIe support
default y helps those porting a config from 2.6 kernel series
from getting "non-functional" wireless drivers with 3.x kernel series.
Signed-off-by: Daniel Kuehn <daniel@kuehn.se>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/Kconfig

@@ -25,6 +25,7 @@ config ATH9K
 
 config ATH9K_PCI
 	bool "Atheros ath9k PCI/PCIe bus support"
+	default y
 	depends on ATH9K && PCI
 	---help---
 	  This option enables the PCI bus support in ath9k.