[U-Boot] [RFC PATCH] u-boot: remove driver lookup loop from env_save()

[Wolfgang Denk <wd@denx.de>]

Dear Maxime,

In message <20180711094838.zyczks6iksp772ir@flea> you wrote:
> 
> I don't really see a use-case for overriding wherever the environment
> at the user-level actually. At the board level, for redundancy or
> transition, yes, definitely, but we can already do that.

If the feature is available, use cases will spring into mind.

Assume you have a eMMC based system which can also boot from other
storage (say, SDCard), and you want to write the current content of
the eMMC environment to the alternative boot device.

Yes, there are usually alternative approaches to perform similar
actions, but an easy way to save lsewhere might be handy, especially
if it comes at low cost.

Best regards,

Wolfgang Denk

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