Profiling::*Callee static variables declared in header

[ibaned]

Declaring a static global variable in a header will cause it to be created in every single translation unit that includes that header. A whole "fake initialize" function was added to silence the compiler's warnings about this. Compiler warnings are telling you something important! These variable declarations should be moved into Kokkos_Profiling_Interface.cpp to avoid bloating the object files of everything that uses Kokkos.

[ibaned]

#865 fixes this