ath9k: Use CONFIG_ATH9K_WOW

Move the WoW code to wow.c and compile it conditionally
based on CONFIG_ATH9K_WOW.

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

diff --cc drivers/net/wireless/ath/ath9k/Makefile
Simple merge

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

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

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

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

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