ath9k: Add channel context structure

The channel context structure is defined to enable
multi-channel concurrency support.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Rajkumar Manoharan <rmanohar@qti.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/channel.c
Simple merge

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

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

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

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