WIP - Add aarch64 preferences

[lyarwood]

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[0xFelix]

IMO we should outline that if not otherwise stated common-instancetypes are implicitly x86? WDYT?

[0xFelix]

Should we add this to every preference?

[lyarwood]

Yup, this is just a minimal draft only touching the Fedora preference.

[lyarwood]

IMO we should outline that if not otherwise stated common-instancetypes are implicitly x86? WDYT?

Yup I'll document that but most of the instance types should be generic enough to work for both.

[0xFelix]

@lyarwood Right, I meant the preferences of common-instancetypes.

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PR needs rebase.

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