Support for arm64-only Waydroid

[wegank]

The default Waydroid images do not work on Apple Silicon due to its lack of 32-bit support. A solution has been posted in waydroid/waydroid#692, and it will be nice if robotnix supports the config out of the box.

[Atemu]

This should be rather simple, you'd only need to set the arch to arm64_only. The option's type enum would need to be adjusted of course.

As for the patches, you can apply them to the source dirs yourself.

Do note that robotnix is not under active development. Some of us still use it and have our own little branches with updates for things we care about but that's about it.