Add analysis namespace to producerCharmHadrons file

Author: zhangbiao-phy

PWGHF/HFC/TableProducer/producerCharmHadronsCharmFemtoDream.cxx

@@ -55,6 +55,7 @@
 
 using namespace o2;
 using namespace o2::framework;
+using namespace o2::analysis;
 using namespace o2::framework::expressions;
 
 struct HfProducerCharmHadronsCharmFemtoDream {