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mesa,panfrost: Increase buffer texture size

Ray Smith requested to merge rsmith/mesa:panfrost-pbo into main

What does this MR do and why?

Increase PIPE_CAP_MAX_TEXEL_BUFFER_ELEMENTS_UINT from the minimum 65k to something much bigger, and the changes required to enable this. Mostly treating buffer textures as 2D to overcome the 16-bit dimension size limit.

(This was originally also enabling PIPE_TEXTURE_TRANSFER_BLIT to allow proper async PBO glReadPixels and friends, but that part exposed other problems that need further work so was removed from this MR.)

Edited by Ray Smith

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