fix USING_PART_OF_NAMESPACE_EIGEN to export ei_ prefixed math functions
fix USING_PART_OF_NAMESPACE_EIGEN to export ei_ prefixed math functions

ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,toastedcrumpets/eigen,TSC21/Eigen,ritsu1228/eigen,pasuka/eigen,pasuka/eigen,Zefz/eigen,toastedcrumpets/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,TSC21/Eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,toastedcrumpets/eigen,ritsu1228/eigen,ritsu1228/eigen,Zefz/eigen,TSC21/Eigen,TSC21/Eigen,ritsu1228/eigen,Zefz/eigen,Zefz/eigen,pasuka/eigen,toastedcrumpets/eigen