r496g register the internal VAS page directory from COPY_SERVER_RESERVED_PDES

NV90F1_CTRL_CMD_VASPACE_COPY_SERVER_RESERVED_PDES (0x90f10106) is the
kernel RM publishing its internal VAS page-table chain - level[0..] with
phys addresses, sizes and page shifts (the handler already parsed and
logged it, then discarded it). Register level[0] as the VAS root with the
progress service so the walker translates every VA of that client, which is
exactly what the X/GL channel needs: its pushbuffer pages and progress
semaphore have no other translation source (fn-54 is external-VAS/UVM
only, the rm_mem content scan finds nothing for these VAs, and the
sysmem/linear window guesses are wrong for the noncontiguous surface).

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