kconfig: qconf: remove ConfigItem::text/setText

Use QTreeWidgetItem::text/setText directly
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/qconf.h

@@ -156,14 +156,6 @@ class ConfigItem : public QTreeWidgetItem {
 
 		return ret;
 	}
-	void setText(colIdx idx, const QString& text)
-	{
-		Parent::setText(idx, text);
-	}
-	QString text(colIdx idx) const
-	{
-		return Parent::text(idx);
-	}
 	// TODO: Implement paintCell
 
 	ConfigItem* nextItem;