pxa2x0: only build hal_diag.c if the internal uarts are used

[David Vrabel]

David Vrabel wrote:
> +        calculated  { CYGHWR_HAL_ARM_PXA2X0_FFUART
> +                      | CYGHWR_HAL_ARM_PXA2X0_BTUART
> +                      | CYGHWR_HAL_ARM_PXA2X0_STUART }

Oops.  Those are the wrong sort of or operator.  Pass me a brown paper
bag, please.  Updated patch applied.

David Vrabel
-- 
David Vrabel, Design Engineer

Arcom, Clifton Road           Tel: +44 (0)1223 411200 ext. 3233
Cambridge CB1 7EA, UK         Web: http://www.arcom.com/
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