[U-Boot] Removing the need for boards.cfg

[Wolfgang Denk]

Dear Masahiro,

In message <20140801225339.D541.AA925319 at jp.panasonic.com> you wrote:
> 
> It that case, can we skip generating boards.cfg ?
> (We can get the board list by 'ls configs' )

This would neither give all build target names no=r do the needed
translation of names (like upper case -> lower case translations),
etc.

Best regards,

Wolfgang Denk

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