vgsp: golden9e - all ctx buffers FBMEM and every promoted VA PDB-mapped

The golden9c cycle reached the server context init and then the GR ctxsw
timed out (FECS_A/B TDR) with host-sysmem MAIN/PATCH/FECS/PRIV/UNR and
unmapped promoted VAs; the golden9d FBMEM test ran on a boot left dirty
by golden9c and its 0x1f is not attributable. The real golden wire carried
FBMEM (physAttr=4) for every ctx buffer, so:
- allocate PATCH/FECS/PRIV/UNR as server FBMEM (PATCH sized by the engine
  geometry query) in gr_ctx_prepare before the PDB build (mode 25 only);
- map PATCH/FECS/PRIV/UNR at their promoted VAs with VIDMEM PTEs in the
  same 2 MB window as MAIN;
- move the FECS/PRIV/UNR and VA-only 3D global VAs into that window and
  give the PA-backed entries PHYS_ATTR_FB.
golden9d's FBMEM channel memdescs are kept.

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