[Merge] lp:~fancycode/goget-ubuntu-touch/set-oem-architecture into lp:goget-ubuntu-touch

[Joachim Bauch]

I tried, but the architecture checks when installing additional snaps in the image are using the API from the "helpers" package, that's why I introduced a "Set..." API there too and are calling both from here.
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https://code.launchpad.net/~fancycode/goget-ubuntu-touch/set-oem-architecture/+merge/276260
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