cmd/snap-seccomp/main_test.go: add syscalls for armhf and arm64

[jdstrand]

This adds needed syscalls based on:

• https://launchpadlibrarian.net/335270158/buildlog_ubuntu-xenial-arm64.snapd_2.27.5+git354.834024b~ubuntu16.04.1_BUILDING.txt.gz
• https://launchpadlibrarian.net/335269966/buildlog_ubuntu-xenial-armhf.snapd_2.27.5+git354.834024b~ubuntu16.04.1_BUILDING.txt.gz

More may be needed...

[mvo5]

Thanks a lot!

[jdstrand]

I verified armhf tests pass. I'm having trouble with the dragonboard so lets commit it and see how things go.

[zyga]

I recall saying something like "let's commit and see how it fails on $arch". Thank you for doing this @jdstrand :-)

[codecov-io]

Codecov Report

Merging #3832 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3832      +/-   ##
==========================================
- Coverage   75.74%   75.73%   -0.02%     
==========================================
  Files         409      409              
  Lines       35388    35388              
==========================================
- Hits        26804    26800       -4     
- Misses       6688     6691       +3     
- Partials     1896     1897       +1

Impacted Files	Coverage Δ
interfaces/sorting.go	98.71% <0%> (-1.29%)	⬇️
overlord/snapstate/snapstate.go	80.42% <0%> (-0.26%)	⬇️
overlord/ifacestate/helpers.go	62.33% <0%> (ø)	⬆️

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