drm/i915/cnl: Fix Cannonlake scaler mode programing.

As Geminilake scalers Cannonlake also don't need and don't have
the "high quality" mode programming.

Cc: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1497047175-27250-15-git-send-email-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/intel_atomic.c

@@ -325,7 +325,7 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
 		}
 
 		/* set scaler mode */
-		if (IS_GEMINILAKE(dev_priv)) {
+		if (IS_GEMINILAKE(dev_priv) || IS_CANNONLAKE(dev_priv)) {
 			scaler_state->scalers[*scaler_id].mode = 0;
 		} else if (num_scalers_need == 1 && intel_crtc->pipe != PIPE_C) {
 			/*