SBUS: Utility function sbus_request_return_array_as_variant
    
    Adds a utility function that returns an array of types values, each of a
    given size, with a given type in a variant. This utility function will be
    used by the GetAll property call.
    
    Reviewed-by: Stef Walter <stefw@redhat.com>
    Reviewed-by: Pavel Březina <pbrezina@redhat.com>