v2: Rebase on top of the for_each_pipe() change adding dev_priv as first
    argument.
Signed-off-by: NDamien Lespiau <damien.lespiau@intel.com>
Reviewed-by: NSivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>