pin-init feature idea: pinnable option

[Benno Lossin]

Is anyone interested in having an `Option` that is compatible with
`pin-init`. So where one could store a `Option<Mutex<T>>`. I have a half
baked patch ready in [1], which I think I created before or after
sending [2]. Anyway, I still have it as a branch and would like to get
rid of it if there is no need for it. Otherwise I'd clean it up & send it.

Feel free to reply on the zulip topic [3] as well.

Cheers,
Benno

[1]: https://github.com/Rust-for-Linux/pin-init/commit/fd00f9159eb8ccbd38f89203060c4443cf7b8efd
[2]: https://lore.kernel.org/all/DC73760NQA0X.29E82RNZCV3FS@xxxxxxxxxx
[3]: https://rust-for-linux.zulipchat.com/#narrow/channel/561532-pin-init/topic/pinnable.20option/with/580115298