xf86-video-savage: (1/2) Implement use of Mastered Image Transfer for EXA UploadToScreen

[Alex Villací­s Lasso]

Under some conditions (documented in this patch), the UploadToScreen 
implementation can make use of the AGP scratch buffer used for XVideo as 
a convenient source for Mastered Image Transfer. The previous 
implementation is still available as a fallback for when AGP 
acceleration is not possible. This requires the AGP scratch buffer to be 
persistent, so the XVideo code is also made aware of an existing DRM 
mapping for the scratch buffer.

-- 
perl -e '$x=2.3;printf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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