QMA6100PSingleton constructor fix pio check warnings (#11313)

Fixes cppcheck issues
  src/motion/QMA6100PSensor.cpp:173: [medium:warning] Member variable 'QMA6100P::rawAccelData' is not initialized in the constructor. Maybe it should be initialized directly in the class QMA6100P? [uninitDerivedMemberVar]
  src/motion/QMA6100PSensor.cpp:173: [medium:warning] Member variable 'QMA6100P::_i2cPort' is not initialized in the constructor. Maybe it should be initialized directly in the class QMA6100P? [uninitDerivedMemberVar]
  src/motion/QMA6100PSensor.cpp:173: [medium:warning] Member variable 'QMA6100P::_deviceAddress' is not initialized in the constructor. Maybe it should be initialized directly in the class QMA6100P? [uninitDerivedMemberVar]

Author: vidplace7

src/motion/QMA6100PSensor.cpp

@@ -170,7 +170,13 @@ QMA6100PSingleton *QMA6100PSingleton::GetInstance()
     return pinstance;
 }
 
-QMA6100PSingleton::QMA6100PSingleton() {}
+// The QMA6100P library leaves these base class members uninitialised until begin() runs
+QMA6100PSingleton::QMA6100PSingleton()
+{
+    rawAccelData = {0, 0, 0};
+    _i2cPort = nullptr;
+    _deviceAddress = 0;
+}
 
 QMA6100PSingleton::~QMA6100PSingleton() {}