batman-adv: extract netdev wifi detection information object

Previously, wifi_flags were stored directly in batadv_hard_iface, which is
created for every network interface on the system (including those never
attached to a mesh interface). This wastes memory and complicates the
long-term goal of lazily allocating batadv_hard_iface only for interfaces
that actually join a mesh.

The problem is that several batman-adv features need wifi detection for
net_devices (and their underlying devices) regardless of whether a
batadv_hard_iface exists for them:

* B.A.T.M.A.N. IV TQ hop penalty calculation
* B.A.T.M.A.N. V ELP probing / throughput estimation
* AP isolation

To decouple wifi detection from batadv_hard_iface lifetime, introduce a
global rhashtable (batadv_wifi_net_devices) mapping net_device pointers to
batadv_wifi_net_device_state objects. Only net_devices that are actually
detected as (indirect) wifi interfaces occupy an entry, keeping the common
(non-wifi) case allocation-free.

Signed-off-by: Sven Eckelmann <sven@narfation.org>

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