vgsp: golden9f - golden channel on the golden VAS with the client PDB

The golden9e ctxsw TDR persisted with capture-faithful FBMEM buffers and
mapped VAs. Source dig: the ladder VAS is IS_EXTERNALLY_OWNED, and on that
path the server's promote defers channel-context binding to UVM (which the
ladder never does), so the engine ctxsw never becomes usable. The real
golden channel runs on the PTETABLE_HEAP_MANAGED golden VAS (client-owned
page tables, not externally owned), which takes the full client-managed
commit path. golden9a/b only failed because that VAS had no page directory:
install the ladder root PDB on the golden VAS via DMA_SET_PAGE_DIRECTORY
before the channel alloc, and bind the golden channel to it.

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