[Nouveau] patch for backlight control with gt 525M (c0)

[Florian Scholz]

Hi,

I wrote a patch for nouveau_backlight.c to support the backlight control of the GT 525M. Only the case NV_C0: is needed to get the backlight control with my NVC0 card working. I don't think that it's worth to add new functions for c0 if the old ones still work.

This is my first patch for the Linux kernel.

Best Regards

Florian Scholz

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