Define a new flag, UVM_FLAG_HOLE, for uvm_map to create a vm_map_entry of

a new etype, UVM_ET_HOLE, meaning it has no backend.

UVM_ET_HOLE entries (which should be created as UVM_PROT_NONE and with
UVM_FLAG_NOMERGE and UVM_FLAG_HOLE) are skipped in uvm_unmap_remove(), so
that pmap_{k,}remove() is not called on the entry.

This is intended to save time, and behave better, on pmaps with MMU holes
at process exit time.

ok art@, kettenis@ provided feedback as well.

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