[En-Nut-Discussion] Added support for SAM7S256

[Ole Reinhardt]

> http://ethernut.cvs.sourceforge.net/ethernut/nut/conf/arch/arm.nut?view=diff&r1=text&tr1=1.19&r2=text&tr2=1.18&diff_format=h
> shows, that a new module at91_adc.c had been added to the configuration. 
> However, the file itself is missing.

Sorry! That was a mistake. I checked in to early the config changes.

the adc driver will follow soon. Hope this does not break compilation
for normal setup. Otherwise please revert the changes.

Bye,

Ole

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