vgsp: GR ladder shared-VAS page-table install and server-managed ctx commit path

- DMA_UPDATE_PDE_2 client control installs the ladder leaf PT through the
  server's own MMU walker on the shared-management VAS (the raw-PDB entries
  are not preserved by the root migration); FLUSH_PDE_CACHE + post-install
  refill + PT diagnostics.
- srvctx registry profile also disables split VAS management; MAP_MEMORY_DMA
  is not served by GSP-RM for this client (NV_ERR_INVALID_FUNCTION), so the
  PDE control replaces it.
- shared-path context commit helper: GPU_INITIALIZE_CTX + PA-only
  GPU_PROMOTE_CTX for the server-reported (or client fallback) MAIN buffer;
  GR_GET_CTX_BUFFER_INFO sends bufferCount=64.
- Result: shared VAS + srvctx no longer wedges; channel/BIND/schedule/token
  green, PBDMA fetches the GPFIFO (GPGet=1); remaining wall is
  ROBUST_CHANNEL_GR_FAULT_DURING_CTXSW (0x2c).

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