etnaviv: flip the switch on MSAA support
The last known issue with MSAA is not reproducible anymore. Flip the debug switch to expose MSAA by default, but still make it possible to disable it if someone hits any problems.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
The last known issue with MSAA is not reproducible anymore. Flip the debug switch to expose MSAA by default, but still make it possible to disable it if someone hits any problems.