mavlink: reorder streams to optimize latency
mavlink: reorder streams to optimize latency

In particular this together with the previous commit reduces timesync
round-trip time spikes by more than 10ms, and makes it generally more
stable.

Other streams are reordered according to onboard priority.

PX4/Firmware,PX4/Firmware,acfloria/Firmware,PX4/Firmware,krbeverx/Firmware,acfloria/Firmware,acfloria/Firmware,PX4/Firmware,krbeverx/Firmware,krbeverx/Firmware,acfloria/Firmware,acfloria/Firmware,krbeverx/Firmware,krbeverx/Firmware,PX4/Firmware,acfloria/Firmware,krbeverx/Firmware,PX4/Firmware,acfloria/Firmware,krbeverx/Firmware,PX4/Firmware