fix compile error for scripts/function_profiler.kp

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
change scripts/function_profiler.kp to use aggregation table

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
enable non-kenrel-symbol integer key showing in histogram

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>