Scalable approach for nl80211_feature_flags

[Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>]

Hi,

There is 'new' approach for specifying various wifi driver flags,
using enum nl80211_feature_flags and wiphy.features.

Problem is, wiphy.features is u32, i.e. it is not scalable
beyond 32 flags.

I propose to re-define 'features' approach - convert it to
use 'bitmap' API like DECLARE_BITMAP for the 'features' and
use bit numbers rather then raw values in the
enum nl80211_feature_flags. Last value will be defined like
NL80211_FEATURE_MAX, and 'features' will auto-size using
DECLARE_BITMAP(features, NL80211_FEATURE_MAX);

Then, user space tools need to be modified as well.

If the direction looks correct, I'll go ahead to prepare patch.

Thanks, Vladimir.