Pixel digitization: log->logf to save some cpu time
A simply change to replace std::log with logf that is less precise but faster for radiation damage code for pixel digitization
This does impact the output, but at the order of floating point precision and is thus completely negligible.
A speed up of 20-30 seconds is seen for a pileup digitization job with 10 events
Note that std::logf wont compile on gcc, it is a known issue, see: https://gitlab.cern.ch/atlas/athena/-/blob/master/InnerDetector/InDetDetDescr/PixelReadoutGeometry/src/PixelModuleDesign.cxx#L130