drm/i915: Fix fastboot scalers for skylake.

The scaler_id in intel_pipe_config_compare should not be checked
when adjusting in intel_pipe_config_compare. The hw scaler id may
be changed in intel_update_pipe_config.
Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -12459,9 +12459,9 @@ intel_pipe_config_compare(struct drm_device *dev,
 			PIPE_CONF_CHECK_X(pch_pfit.pos);
 			PIPE_CONF_CHECK_X(pch_pfit.size);
 		}
-	}
 
-	PIPE_CONF_CHECK_I(scaler_state.scaler_id);
+		PIPE_CONF_CHECK_I(scaler_state.scaler_id);
+	}
 
 	/* BDW+ don't expose a synchronous way to read the state */
 	if (IS_HASWELL(dev))