refactor: Unify GTPin initialization logic between APIs

Add support for new GTPin loading logic in OCL path, similar to existing
in L0 - invoking exposed, dedicated API call (OpenGTPinOCL).
- Move logic to shared, including unit tests
- Check whether instrumentation is required on
  clGetPlatformIDs API call, and if yes,
  make a call to OpenGTPinOCL function.
Signed-off-by: Kacper Nowak <kacper.nowak@intel.com>

opencl/source/api/api.cpp

@@ -297,6 +297,7 @@ cl_int CL_API_CALL clGetDeviceIDs(cl_platform_id platform,
         /* If no suitable device, set a error. */
         if (retNum == 0)
             retVal = CL_DEVICE_NOT_FOUND;
+
     } while (false);
     TRACING_EXIT(ClGetDeviceIDs, &retVal);
     return retVal;
@@ -438,6 +439,13 @@ cl_context CL_API_CALL clCreateContext(const cl_context_properties *properties,
                 break;
             }
         }
+        /* At this point we can safely notify GTPin to allow initialization */
+        EnvironmentVariableReader envReader;
+        if (envReader.getSetting("ZET_ENABLE_PROGRAM_INSTRUMENTATION", false)) {
+            if (false == pPlatform->notifyGtpinInit()) {
+                retVal = CL_INVALID_OPERATION;
+            }
+        }
         if (CL_SUCCESS != retVal) {
             break;
         }