xf86-video-savage: EXA: use memcpy instead of loop for UploadToScreen operation

[Alex Villací­s Lasso]

Optimization. Saves one compare per DWORD for common case where BCI 
queue has ample space for bitmap data.

Changelog:
* EXA: use memcpy instead of loop for UploadToScreen operation

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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