wl12xx: AP-mode - set STA HT capabilities when adding a STA

In addition, set global HT operation mode via ACX_HT_BSS_OPERATION when
a change is detected by usermode

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>