[U-Boot] Deprecation (planned removal) of 'maintainer-less' code

[Graeme Russ]

Hi Wolfgang,

I notice you've finally gotten sick of 'talking to the wall' regarding
unmaintained code (net, USB, AVR32, etc.)

To make life a little easier for everyone, maybe we can put together a list
of U-Boot sub-components which do not have an active maintainer so we can
discuss what to do about it as a whole rather than in a piecemeal fashion

Regards,

Graeme