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xfree86: Support Moore Threads GPU

Peng Jin requested to merge peng.jin/xserver:pr/peng.jin/support-mtgpu into master

During testing Moore Threads GPU with ubuntu lightdm+gnome+xorg desktop environment, we found that it can load DDX with mtgpu_drv.so. But during screen locking, lightdm will start a new Xorg to display a greeter, this new Xorg would match modesettings_drv.so instead of a correct one mtgpu_drv.so.

After debuging, we found the root cause is that xf86VideoPtrToDriverList function of Xorg is absent support for Moore Threads GPU.

Edited by Peng Jin

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