drm/i915/skl+: Enable pipe CSC on cursor planes. (v2)

Extend this to SKL and BXT as it's needed for these platforms as well.

v2: Change if condition to HAS_DDI() instead of listing each platform
Signed-off-by: NBob Paauwe <bob.j.paauwe@intel.com>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -9927,7 +9927,7 @@ static void i9xx_update_cursor(struct drm_crtc *crtc, u32 base)
 		}
 		cntl |= pipe << 28; /* Connect to correct pipe */
 
-		if (IS_HASWELL(dev) || IS_BROADWELL(dev))
+		if (HAS_DDI(dev))
 			cntl |= CURSOR_PIPE_CSC_ENABLE;
 	}