Revert "mavlink: GLOBAL_POSITION_INT send without lat/lon availability"
Revert "mavlink: GLOBAL_POSITION_INT send without lat/lon availability"

This reverts commit ad14796b5feb556aa9da8895e12b62b96105a31c.

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