tristate features will automatically disable if dependencies marked
as required are missing.
Packagers can manually override using `auto_features`.
Link: https://mesonbuild.com/Build-options.html#features
This is not complete enough for LVFS-usage, but good enough to use with commands
such as fwupdtool. It's likely newer kbd and tp firmware will be required to
integrate with the fwupd in all required ways.
