Bug#915229: src:linux: Updated driver needed for Amazon ENA ethernet

[Noah Meyerhans <noahm@debian.org>]

Package: src:linux
Severity: important

ENA is an ethernet adaptor used on Amazon EC2 cloud instances. Version 2.0.2 of
the ENA driver was added to the mainline kernel as of version 4.20. This
version includes fixes for various bugs, some of which result in kernel panics,
and is needed in order to enable access to features available on newer
hardware. It is also needed in order to support the recently announced
arm64-based instances.

I have opened https://salsa.debian.org/kernel-team/linux/merge_requests/77 to
backport ENA 2.0.2 to 4.19 for buster.

I have a WIP branch for stretch's 4.9 kernel at
https://salsa.debian.org/noahm/linux/tree/stretch+ena2 This requires a bit more
effort as 4.9 contains a much older version of the driver.

Thanks
noah