CPUInfo: make sure m_cpuFeatures is initialized

m_cpuFeatures is OR'ed into in implementations, but seemingly none of
them initialized this field before they OR into, so do it first in
CCPUInfo class.

xbmc/utils/CPUInfo.h

@@ -115,7 +115,7 @@ class CCPUInfo
   std::size_t m_totalTime{0};
 
   int m_cpuCount;
-  unsigned int m_cpuFeatures;
+  unsigned int m_cpuFeatures{0};
 
   std::vector<CoreInfo> m_cores;
 };