Switch 2 GPU: syncpt server, identity GPU mappings, Ampere classes, submit fences

- gsv 204: real syncpoint shared page (values mirrored from host1x, armed waits
  acknowledged by a 500us poller); first handle is the writable request event.
- syncpt 22/201/202: per-slot events signalled through host1x guest actions.
- nx2:gpu sub 101 memory is identity-mapped (GPU VA == CPU VA) into every
  nvhost-as-gpu GMMU via Nx2GpuMemoryRegistry; SMMU physical range widened to
  34 bits for the 10/12 GiB layouts.
- Puller runs Ampere 3D/compute/copy classes on the Maxwell engines; class 0 unbinds.
- Turing+ macros are skipped (Eden only has the Fermi macro ISA).
- Submits with increment_value get Eden-side syncpoint increments, since NVN2
  signals completion with semaphore releases only.

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