i915/gem_ctx_shared: Prebind both context images

If we are using an aliasing-ppgtt, the context images are in the same
virtual address space as our target objects. We have to be careful that
cloning and using a new context does not evict our unreferenced target
object. To avoid that, we first bind both context images while creating
the hole in the address space to ensure that the hole is still available
later on.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>

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