vgsp: GR server-managed context commit experiments (EVICT, VA promote, external path)

Rung-2 bisection after the GET_CTX_BUFFER_INFO ABI fix made the server ctx
geometry visible (8 buffers; MAIN 0x133000 FBMEM, PATCH 0x5000):

- map the server MAIN/PATCH at the ladder ctx VAs with FBMEM PTEs and send
  the UVM-shape VA-only promote (bInitialize=0, bNonmapped=0). On the shared
  VAS the per-entry VA branch calls vaListSetManaged(NV_FALSE) and returns
  0x40 because the server pre-booked MAIN as managed; EVICT_CTX (status 0)
  does not release that booking.
- try the same VA promote on the external VAS where the server did not book
  (kgrctxMapCtxBuffers early-returns): the promote never replies (-110) and
  leaves the device in the locked fail-safe (WPR2 up, unbound). Do not repeat
  this shape without a new hypothesis.
- FBMEM physAttr selection for the server MAIN fixed (aperture 2 -> 0x4);
  gsp_phys_rmcall_srv_ctxcommit parameter added (0 = pure server-managed,
  no client promote).
- query prints all 16 entries and records PATCH; query ABI 80-B/5136.

Hardware state after the external-VAS run: GPU wedged, reboot required (no
automated reboot). All shapes stay default-off behind gr_promote=17 +
gsp_phys_srv_ctxbuf.

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