xf86-video-savage: add missing xf86CrtcConfigInit in SavagePreInit

[Alex Villací­s Lasso]

With the latest git for xserver and the latest git for savage, an 
attempt to start up crashes the server unless this patch is applied. It 
seems that an explicit xf86CrtcConfigInit() is now required in the 
PreInit stage of the driver setup. I found via valgrind that the absence 
of this call causes several invalid reads, but only the one triggered by 
DRIFinishScreenInit() actually crashes the server on startup. Grepping 
through the git code, only xf86-video-intel, xf86-video-ati, 
xf86-video-nv and xf86-video-siliconmotion have this call in their code. 
Does this mean that any other driver that tries to init DRI will crash 
in the same way with latest xserver?

Changelog:
* Add missing xf86CrtcConfigInit in SavagePreInit. Fixes a crash on 
startup with latest xserver git.

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

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