ProjectExplorer: Relayout of DeviceSettingsWidget UI

The DeviceSettingsWidget is using vertical-scrolling-only ScrollArea
for both General and Type Specific groups.
This provides "Type Specific" group more space to display information.

Task-number: QTCREATORBUG-9981

Change-Id: If37d8bb9a65b5392ef4fd488b4c8f0c9f3cf35e8
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
Reviewed-by: David Kaspar <dkaspar@blackberry.com>