Minor changes: GCM command, PKG loader & SysCalls

* Fixed incorrect time displayed on NV4097_GET_REPORT.
* Fixed small bug in PKGLoader::UnpackEntry
* Moved some code in SC_Time.cpp
* Auxiliary function declarations of SC_Time.cpp in SC_Time.h
* Updated cellFsUnlink. *This won't work until ExistsFile is fully
implemented*.