lib/intel_bufops: Introduce buffer operations

Different GENs supports different tile surfaces. Older GENs
have HW fences to allow X / Y surface tiling / detiling.
Newer GENs have to tile / detile such surface in software.

To make test developer life easier this code adds buffer
operations (short buf_ops) to use appropriate functions allowing
copying linear buffer to BO and from BO to linear buffer
regardless GPU generation and tiling/swizzling within BO. For GENs
having fences support preference is to use them if they are available
(X / Y tiling is probed on buf_ops initialization).

Note: on Gen2 code supports only HW tiling at the moment.

Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Katarzyna Dec <katarzyna.dec@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

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