Draft: panfrost: Initial Valhall OpenGL ES driver support

Alyssa Rosenzweig requested to merge alyssa/mesa:valhall-cmdstream into main

This contains the initial OpenGL ES driver patches required for Mali-G57 support. It does NOT contain the compiler (so is pretty useless on its own). @bbrezillon as the interested reviewer for this subset of the Valhall branch.

Draft because the commit history is pretty ugly. And I keep wanting to get "conformant" before landing patches but that's.. unrealistic at this stage of development. Probably landing some of the "easier" patches here would be good.

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