rnndb/memory/gf100_pbfb: Add range for NV_PFB_FBPA_MC[i]
rnndb/memory/gf100_pbfb: Add range for NV_PFB_FBPA_MC[i]

Nvidia documentation discloses an additional MMIO range related to
framebuffer partition addressing (FBPA), specifically in their
terminology NV_PFB_FBPA_MC[i].

  NV_PFB_FBPA_MC[i]   0x11D000+(i * 0x1000)

  The number of NV_PFB_FBPA_MC[i] ranges remains 3.

For consistency with existing envytools approaches, conversion has
been undertaken to name this range PBFB_MC[i].

Source:
  https://download.nvidia.com/open-gpu-doc/pascal/1/gp100-fbpa.txt

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