drm: Constify drm_mode_config atomic helper private pointer

The drm_mode_config helper private field points to a structure of
function pointers that don't need to be modified at runtime. Make it
const.

Signed-off-by: Laurent Pinchart <[email protected]>
Reviewed-by: Gabriel Krisman Bertazi <[email protected]>
Acked-by: Brian Starkey <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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