Add ATLAS_CHECK_THREAD_SAFETY to SiDigitization package

Susumu Odarequested to merge
oda/athena:master-SiDigitization into master

Add ATLAS_CHECK_THREAD_SAFETY to SiDigitization package and add std::atomic to m_sielement in SiChargedDiodeCollection class.

https://twiki.cern.ch/twiki/bin/viewauth/AtlasComputing/CheckerGccPlugins

RunTier0Tests.py was fine. RunTier0Tests.SiDigitization.log

Edited by Susumu Oda

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