docs: Move the 802.11 guide into the driver-api manual

Put this documentation with the other driver docs and try to keep the top
level reasonably clean.

Cc: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/driver-api/80211/conf.py

@@ -0,0 +1,10 @@
+# -*- coding: utf-8; mode: python -*-
+
+project = "Linux 802.11 Driver Developer's Guide"
+
+tags.add("subproject")
+
+latex_documents = [
+    ('index', '80211.tex', project,
+     'The kernel development community', 'manual'),
+]