feat(ec2): add X2gd instances

[jumic]

Add support for X2gd instances.

Announcement: https://aws.amazon.com/about-aws/whats-new/2021/03/announcing-new-amazon-ec2-x2gd-instances-powered-by-aws-graviton2-processors/

Closes #16794.

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[gitpod-io]

[jumic]

Deployment tested successfully in region us-east-1:

new ec2.Instance(this, 'MyInstance', {
  vpc,
  instanceType: ec2.InstanceType.of(ec2.InstanceClass.X2GD, ec2.InstanceSize.MEDIUM),
  machineImage: new ec2.AmazonLinuxImage({
    generation: ec2.AmazonLinuxGeneration.AMAZON_LINUX_2,
    edition: ec2.AmazonLinuxEdition.STANDARD,
    virtualization: ec2.AmazonLinuxVirt.HVM,
    storage: ec2.AmazonLinuxStorage.GENERAL_PURPOSE,
    cpuType: ec2.AmazonLinuxCpuType.ARM_64,
  }),
});

Probably labels pr-linter/exempt-readme and pr-linter/exempt-test are necessary to merge this PR.

[peterwoodworth]

Thanks for keeping us updated!

[jumic]

@peterwoodworth Thanks for reviewing.
If nobody else has to approve this change, could you please add the labels mentioned above to merge this PR?

[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
• Commit ID: ca55a28
• Result: SUCCEEDED
• Build Logs (available for 30 days)

Powered by github-codebuild-logs, available on the AWS Serverless Application Repository

[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).