Export DCR symbols - resubmitting

Hi,

This patch is needed in order to compile kernel modules that uses some
of the DCR functions. For example, compiling powerpc emac driver as
module it is needed.

Arnd, Dennis Spathis pinged me about this today and I thought it was a
closed issue but still open. If you find it okay please upstream it or
let me know if any modifications needed. Thanks.

-- 
Bye,

Murali