dri: propagate extra dma_buf import attributes to the drivers

v2: do not break ABI, but instead introduce new entry point for
    dma buffers and bump up the dri-interface version to eight

v3 (Chad): allow the hook to specify an error originating from the
           driver. For now only unsupported format is considered.
           I thought about rejecting the hints also as they are
           addressing only YUV sampling which is not supported at
           the moment but then thought against it as the spec is
           not saying one way or the other.

v4 (Eric, Chad): restrict to rgb formatted only

v5: rebased on top of i915/i965 split

v6 (Chad): document using full extension name

Signed-off-by: Topi Pohjolainen <[email protected]>
Reviewed-by: Chad Versace <[email protected]>

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