The VTune™ Analyzer Driver Kit is a package that is needed to do sampling profiling and build VTune sampling driver on Linux* for a non-supported version of Linux kernel. It consists of two parts: pre-compiled drivers for supported Linux distributions and source code of Linux kernel sampling driver. If you're installing VDK on one of unsupported Linux distributions you might need to recompile the driver to use sampling. To do that you also need development version of Linux kernel package or Linux kernel source package installed and configured properly. There are several versions of VDK.
Please check the Intel VDK site for the recent version of VDK package for your VTune version and more details. You only need to update VDK package in case Linux kernel was updated to the last released and installed VDK did not work with it. You can perform Call Graph profiling without loading sampling driver at all.