Fix enum names of audio/video features

The feature enum names and documentation gave the impression it could
control audio and video output, while they only control input.

Also removed documentation of non connected feature permissions for
Notifications and GeoLocation.

Change-Id: Ia35142ca691ebd6059b7472e9803fda8cbd84813
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>