Did it on several other boards but not on DragonBoard.
1) I recommend you to use a sensor mezzanine board or a level shifter since the DragonBorad is 1.8Vdc.
htmlYou cannot connect the DHT directly to the DragonBoard
2) Optional: If you use the sensor mezzanine you may as well use the embedded AVR (Arduino) to control it since it has all the library to run the DHT11 or 22 with ease.
DHT11/22 use ONE-WIRE protocol.