[U-Boot] dfu: make data buffer size configurable

[Wolfgang Denk]

Dear Heiko,

In message <51B17815.8060904 at denx.de> you wrote:
> 
> and I see no longer the above error! So I see two solutions
> for my problem:
> 
> - make DFU_DATA_BUF_SIZE in U-Boot smaller or configurable
> - make the timeout in dfu-util bigger or configurable

I think we have just learned that the one-size-fits-all approach does
not work for everybody.  Actually both parameters should be
configurable.

Best regards,

Wolfgang Denk

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