dt-bindings: net: Add generic wireless controller

Wireless controllers share the common properties.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: David Heidelberg <david@ixit.cz>
Link: https://patch.msgid.link/20250324-dt-bindings-network-class-v5-2-f5c3fe00e8f0@ixit.cz


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