Android: single updates for PositionSource and SatelliteSource take too long

Android positioning plugin acts strangely when it comes to individual updates for both position and satellite info.

For position info the update always comes after the full specified timeout expires, even if it was received earlier. The implementation makes me think that it's done on purpose, as there is an internal list of received updates, and then the best one is selected from them. But the problem is that default timeout on Android is 2 minutes, which is probably too long for most cases. So I think we can do better.

As for the satellite updates, it seems that a single satellite update does not come at all...