[SRU D/B/X aws] Start shipping modules-extra

[Stefan Bader]

BugLink: https://bugs.launchpad.net/bugs/1836706

To be consistent across derivatives and in order to allow
out of tree modules to properly compile and giving a quick
work-around to people needing additional modules by default,
we re-enable shipping linux-modules-extra.

As follow-up, the patch kits for the various aws branches
(and related meta).

-Stefan