Remove blocking condition disallowing GTPin instrumentation using OCL interface
for stateless kernels (where SSH size == 0). It is required in order to
reintroduce support for GTPin on platforms supporting stateless
addressing model only.
- Always allow for adding surface state for GTPin use, even if kernel
SSH size == 0,
- Correct addSurfaceState function logic
- Remove and/or modify GTPin unit tests based on previous approach
- Wrap logic for pushing BT and SSH into separate function
- Minor code refactor; remove not needed test function
Signed-off-by: Kacper Nowak <kacper.nowak@intel.com>