xf86-video-savage: fix arbitrary horizontal downscaling of XVideo

[Alex Villací­s Lasso]

Current git of xf86-video-savage has problems with downscaling an XVideo 
overlay horizontally - it will get stuck at a particular resize past 2:1 
downscale. This patch allows the driver to use the register that directs 
power-of-two downscale (MM8190) and arbitrary fractional downscale in 
1:1 to 2:1 range (MM8198) in order to implement arbitrary downscaling 
down to 64:1.

Changelog:
* Fix arbitrary downscale for xvideo in old savage stream engine.

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

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