v2: Add stepping check for WaDisableSDEUnitClockGating.
Signed-off-by: NNick Hoath <nicholas.hoath@intel.com>
Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com>
[danvet: Rebase.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>