Hawaiian did not order their A321s with AVOD seat back entertainment such as can be found on their A330s.
From
HawaiianAirlines.com:
"Guests seated in the Main Cabin and Extra Comfort section of our A321neo aircrafts can stream inflight entertainment to their mobile devices, tablets or laptops."
Though it does not specifically state it, can it be assumed First Class customers will be offered a tablet?