[linux-aws][v3] hibernation support for linux-aws

[Kamal Mostafa]

[v2]: rebased to latest master branch
[v3]: additional patches for Xenial; rebased to latest master branch

BugLink: https://bugs.launchpad.net/bugs/1831940

Additional AWS-specific and mainline patches are required to support
hibernation across the various types of AWS instances.

The following pull requests for linux-aws-xenial and linux-aws-bionic
provide the necessary functionality, and should only impact the
hibernation and resume paths.

 -Kamal