xf86-video-savage: (1/2) YUV packed buffer and YV12 planar buffer (if required) are now separate allocations

[Alex Villací­s Lasso]

This is a preparation for the next patch (placing XVideo YV12 data in 
AGP memory). Currently a single buffer is allocated for YV12 planar data 
and the YUY2 packed data that is the true format that the card can 
display. This patch splits the buffers into two separate allocations, 
and adds the capability to specify the offset of the planar data in 
framebuffer memory.

Changelog:
* XVideo: Separate allocations of YV12 planar data and YUY2 packed data.

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

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