[PATCH 4/5] env: allow default environment to be amended from control dtb

[Wolfgang Denk]

Dear Tom,

In message <20201117182353.GB5340 at bill-the-cat> you wrote:
> 
> Adding in Marek as well since I believe he's been doing things with
> append-only environment, and it would be good to make sure we have
> something that fits everyones needs, and doesn't break what people are
> already doing as well.

Actually we should stop people from doing things the wrong way.
Misusing the "default environment" is not a good thing.

That does not mean that the use cases should not be supported - but
in a correct way.

Best regards,

Wolfgang Denk

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