Plane: fixed uartA baud rates for APM1
Rover: fixed baud rates on APM1
Copter: fixed baud rates on APM1
Plane: only send RC_CHANNELS_SCALED in HIL

saves a bit of telemetry bandwidth
Copter: only send RC_CHANNELS_SCALED in HIL

saves a bit of telemetry bandwidth
Rover: only send RC_CHANNELS_SCALED in HIL

saves a bit of telemetry bandwidth