In case that there are OBSS that do not know how to properly
interpret 26-tone RU OFDMA transmissions, instruct the FW not
to use such transmissions.

The check is currently only performed upon association.
Signed-off-by: NIlan Peer <ilan.peer@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>