lib/intel_bufops: clarify buffer ownership rules

To avoid intel_buf handle leakage we need to clarify of buffer ownership
rules. So we currently have:

1. intel_buf_init(), intel_buf_create() which create handle and take
   ownership of such handle.
2. intel_buf_init_using_handle(), intel_buf_create_using_handle() which
   take bo handle from the caller and doesn't take ownership.

intel_buf_close()/intel_buf_destroy() will honour ownership and skip
closing handle if buffer is not owned.

To take/release buffer ownership intel_buf_set_ownership() can be used.

Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Cc: Dominik Grzegorzek <dominik.grzegorzek@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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