Follow the Linux Kernel 4.15
Add Arm64 minimalFeatures test

Change-Id: I1c092521ba59b1e4096c27786fa0464f9ef7d311
Reviewed-on: https://go-review.googlesource.com/103636
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>