drm/i915/gen9: Implement WaForceEnableNonCoherent
v2: Don't add WaHdcDisableFetchWhenMasked. Add stepping check for WaForceEnableNonCoherent Signed-off-by: Nick Hoath <nicholas.hoath@intel.com> Reviewed-by: Damien Lespiau <damien.lespiau@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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