[coreboot] copy libpayload config to stage directory

[Stefan Reinauer]

Jordan Crouse wrote:
>> * create directories explicitly. Not all versions of install know -D
>> * install libpayload-config and libpayload.config, too.
>>
>> Signed-off-by: Stefan Reinauer <stepan at coresystems.de>
>>     
> Acked-by: Jordan Crouse <jordan.crouse at amd.com>
>
> Would it be less confusing if we named config.h libpayload-config.h
> from the beginning and used the same name internally and externally?
>   
Yes, definitely.



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