Update code related to getTileIdx

source/Lib/CommonLib/CodingStructure.cpp

source/Lib/CommonLib/CodingStructure.h

source/Lib/CommonLib/ContextModelling.cpp

source/Lib/CommonLib/PictureParameterSet.cpp

source/Lib/CommonLib/PictureParameterSet.h

source/Lib/CommonLib/UnitPartitioner.cpp

source/Lib/DecoderLib/CABACReader.cpp

source/Lib/EncoderLib/CABACWriter.cpp

source/Lib/EncoderLib/InterSearch.cpp