ath9k: Enable TSF Out of Range Interrupt

This patch lays the groundwork for handling TSF Out of Range
interrupt, which will be used for power save later on.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/net/wireless/ath9k/beacon.c
Simple merge

diff --cc drivers/net/wireless/ath9k/hw.c
Simple merge

diff --cc drivers/net/wireless/ath9k/hw.h
Simple merge

diff --cc drivers/net/wireless/ath9k/main.c
Simple merge

diff --cc drivers/net/wireless/ath9k/reg.h
Simple merge