RFC: Bump numbers of supported UBO number to 16 on GM107 and later

Closed Karol Herbst requested to merge karolherbst/mesa:more_cbs into main

No idea if any application actually makes use of so many, but I have no better idea how to use the other ubos for. Shader constants can be included in the driver constbuf we already have as there is still enough space for that.

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