wifi: mac80211_hwsim: support HE 40 MHz in 2.4 GHz band

We are missing the flag that indicates that capability
of 40 MHz bandwidth support in HE on the LB.
Add it.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://msgid.link/20231220075830.4f10c6b64d1a.I1ba6905c806be6e0548ed15130c0bbb2ee04c9fd@changeid


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