iris: Defer closing and freeing VMA until buffers are idle.

There will unfortunately be circumstances where we cannot re-use a
virtual memory address until it's no longer active on the GPU.  To
facilitate this, we instead move BOs to a "dead" list, and defer
closing them and returning their VMA until they are idle.  We
periodically sweep these away in cleanup_bo_cache, which triggers
every time a new object's refcount hits zero.

Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>
Tested-by: Jordan Justen <[email protected]>

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