Remove android branch setup for QtConnectivity

The branch is no longer needed and will be removed.
We don't need its CI configuration anymore.

Change-Id: I58dc69ee95c8d5c8c04ce51fd5da9e36e3a316d8
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Simo Fält <simo.falt@digia.com>