iwlwifi: show command string for REPLY_D3_CONFIG

missing the string, add it

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rx.c b/drivers/net/wireless/iwlwifi/iwl-agn-rx.c
index fdb4c37..087fd52 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rx.c
@@ -117,6 +117,7 @@
 		IWL_CMD(REPLY_WOWLAN_TKIP_PARAMS);
 		IWL_CMD(REPLY_WOWLAN_KEK_KCK_MATERIAL);
 		IWL_CMD(REPLY_WOWLAN_GET_STATUS);
+		IWL_CMD(REPLY_D3_CONFIG);
 	default:
 		return "UNKNOWN";