mac80211: limit bandwidth in HE capabilities

If we're limiting bandwidth for some reason such as regulatory
restrictions, then advertise that limitation just like we do
for VHT today, so the AP is aware we cannot use the higher BW
it might be using.

Fixes: 41cbb0f5

 ("mac80211: add support for HE")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20220202104617.70c8e3e7ee76.If317630de69ff1146bec7d47f5b83038695eb71d@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>