staging: vt6656: use ieee80211_tx_info to replace need_mic

Use the info->control.hw_key to replace need mic which is only
present when info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/e8969f47-ffc7-6eb6-9f3c-72b06970c1b8@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>