[PATCH]: Disable 11ax/HE functionality for an Interface based on DRV capability

[Deepti Panchal]

This mail describes the purpose of the attached "hostapd" patch.
The patch avoids issue when there is mismatch between user's 11ax config and DRV capability

Behavior (without the patch): 
==========================
    Non-HE capable interface advertising HE IEs/Capabilities in Beacon/Probe Response/Association Response frames if "ieee80211ax=1" configuration is used

Patch Description:
================
    1. The HE capability for an AP iface was read from the driver, but was not used to update the "drv_flags" for the interface
    2. Change is now added to update the HE capability in the "drv_flags" of the interface
    3. If the interface does not support HE capability, the "iface->conf->ieee80211ax" flag is set to 0
    4. Now Beacons/Probe response/Association Response will advertise HE capabilities ONLY if the interface is HE capable

Patch Verification:
=================
1.	For Intel and NXP non-11ax/HE capable chip/interface, when "ieee80211ax=1" is used in the config file, NO HE IEs are added in the Beacon/Probe Response/Association Response frames
2.	For NXP 11ax/HE capable chips, the HE IEs get added correctly to the required MGMT frames

Thanks,
Deepti
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