drm/i915: Introduce enableddisabled helper

Similar to existing yesno and onoff and use it throughout the code.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1479385814-2358-2-git-send-email-tvrtko.ursulin@linux.intel.com
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 374a733..08ab6d7 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -1722,7 +1722,7 @@ int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
 
 	DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
 		      connector->name,
-		      panel->backlight.enabled ? "enabled" : "disabled",
+		      enableddisabled(panel->backlight.enabled),
 		      panel->backlight.level, panel->backlight.max);
 
 	return 0;