freedreno: a7xx support for computerator and additional a7xx reg definitions

Merged Danylo Piliaiev requested to merge Danil/mesa:freedreno/a7xx/computerator-a7xx into main

Not everything works correctly, e.g. stib seems flakey while stg seems alright.

To actually test new instruction !21498 (merged) would need to be rebased.

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