Create interface for navigator calls and implement for BPS and PPS

Create interface for navigator calls and implement for BPS and PPS

Makes QQnxServices available on non-BPS systems by delegating to an interface
which is implemented on systems with BPS using the currenly used navigator API
and on systems without BPS by sending an appropriate message to the navigator's
PPS service interface.

Change-Id: I0e32fb11e6debb7b7b4693c0bc02af4f75ee2162
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>