BugLink: https://bugs.launchpad.net/bugs/1903087
Add the nitro_enclaves driver from mainline to linux-aws/{focal,bionic-5.4} and
linux-aws/{groovy,hirsute}. The driver is supplied by mainline commits [see
buglink], which are all clean cherry picks for groovy with a couple of trivial
backports for focal.
-Kamal