Workaround ROOT serialization bug affecting CalDet<PadFlafs>

ROOT has an issue when serializing std::vector<T> where T is a scoped
enum backed by something which has size different from int one.

This is true for any architecture, it just happens to be more lethal on
ARM. For more details root-project/root#16312.

Add explicitly types to the linkdef while at it.

DataFormats/Detectors/TPC/include/DataFormatsTPC/Defs.h

@@ -97,7 +97,7 @@ enum class StatisticsType {
   MeanStdDev   ///< Use mean and standard deviation
 };
 
-enum class PadFlags : unsigned short {
+enum class PadFlags : unsigned int {
   flagGoodPad = 1 << 0,      ///< flag for a good pad binary 0001
   flagDeadPad = 1 << 1,      ///< flag for a dead pad binary 0010
   flagUnknownPad = 1 << 2,   ///< flag for unknown status binary 0100

Detectors/TPC/base/include/TPCBase/CalArray.h

@@ -169,6 +169,7 @@ class CalArray
 
   /// initialize the data array depending on what is set as PadSubset
   void initData();
+  ClassDefNV(CalArray, 1)
 };
 
 #ifndef GPUCA_ALIGPUCODE

Detectors/TPC/base/src/TPCBaseLinkDef.h

@@ -21,6 +21,7 @@
 #pragma link C++ class o2::tpc::CalArray < unsigned> + ;
 #pragma link C++ class o2::tpc::CalArray < short> + ;
 #pragma link C++ class o2::tpc::CalArray < bool> + ;
+#pragma link C++ class o2::tpc::CalArray < o2::tpc::PadFlags> + ;
 #pragma link C++ class o2::tpc::CalDet < float> + ;
 #pragma link C++ class o2::tpc::CalDet < double> + ;
 #pragma link C++ class o2::tpc::CalDet < int> + ;
@@ -60,6 +61,8 @@
 #pragma link C++ class o2::conf::ConfigurableParamHelper < o2::tpc::ParameterGas> + ;
 #pragma link C++ enum o2::tpc::AmplificationMode;
 #pragma link C++ enum o2::tpc::DigitzationMode;
+#pragma link C++ enum o2::tpc::PadFlags;
+#pragma link C++ enum o2::tpc::PadSubset;
 #pragma link C++ struct o2::tpc::ParameterGEM;
 #pragma link C++ class o2::conf::ConfigurableParamHelper < o2::tpc::ParameterGEM> + ;
 #pragma link C++ class o2::tpc::IonTailSettings + ;

Detectors/TPC/calibration/include/TPCCalibration/IDCCCDBHelper.h

@@ -32,7 +32,7 @@ struct IDCOne;
 struct FourierCoeff;
 template <typename DataT>
 struct IDCDelta;
-enum class PadFlags : unsigned short;
+enum class PadFlags : unsigned int;
 
 template <class T>
 class CalDet;

Detectors/TPC/calibration/include/TPCCalibration/IDCGroup.h

@@ -24,7 +24,7 @@
 namespace o2::tpc
 {
 
-enum class PadFlags : unsigned short;
+enum class PadFlags : unsigned int;
 
 template <class T>
 class CalDet;