Android: Allow modules to specify permissions/features

Some modules, such as Qt Multimedia, needs special permissions
to avoid getting exceptions at run-time. We should apply these
by default to the AndroidManifest.xml so that an application
using e.g. the camera will work out of the box.

Task-number: QTBUG-33953
Change-Id: Ibc1f086d249197b63e7ed1075ae7d54bdd1212f2
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
Reviewed-by: Christian Stromme <christian.stromme@digia.com>