nx2: pace Switch 2 presents to a 60 Hz vblank

The console flips one frame per vblank and holds the rest in the swapchain,
which caps a game at 60 fps. vi2 229 reports every buffer slot free at once,
so nothing paced title 4: it presented at 90-160 fps and its frame-stepped
timing, audio included, ran ahead. Hold each present until the next vblank,
scaled by the speed limit, without banking time lost to slow frames.

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