Highly unlikely, probably impossible. 928 got AWS support because it had hardware capable of taking advantage of both LTE band 4 (AWS) and band 13. Lumia 822 only has support for LTE band 13, which is not AWS.
The specs confirming the hardware capability for both are at nokia.com if you want to take a look. Unless AWS support is completely hidden away in the 822 (and nobody bothered to put it on the spec sheet), it won't be possible.