wil6210: Tx management frame

Implement management frame passing. In order to receive frame on the other
side, remain_on_channel() should be implemented as well

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/net/wireless/ath/wil6210/cfg80211.c
Simple merge

diff --cc drivers/net/wireless/ath/wil6210/wil6210.h
Simple merge

diff --cc drivers/net/wireless/ath/wil6210/wmi.c
Simple merge