Add support for DSP diagnostics

Hello

The following patch adds the infrastructure needed in order to POST any DSPs in a board.

Regards

Pantelis

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Added, thanks.

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
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