https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/migrating-latest-types.html
1). Update the AWS PV drivers manually
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Upgrading_PV_drivers.html#aws-pv-upgrade
2). Update the ENA driver (Part 2 of the top link)
3). Update the config tools in step 4
I did not need to do steps 3, 5-7 for changing t3a.large to m7a.large