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>
Git-commit: 1647f12f1b511c2629b9b8d23061aa54ad8a9795
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[lkuch@codeaurora.org: do not use aggregated mgmt_tx_params structure
 not yet available in this kernel version]
Signed-off-by: Liron Kuch <lkuch@codeaurora.org>