Add cl_khr_kernel_clock tests (#1960)

Adds cl_khr_kernel_clock test.

Also fixes failure in the compiler defines for extension compiler
subtest when cl_khr_kernel_clock is supported.

test_conformance/extensions/cl_khr_kernel_clock/main.cpp

@@ -0,0 +1,29 @@
+// Copyright (c) 2024 The Khronos Group Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#include "procs.h"
+#include "harness/testHarness.h"
+
+test_definition test_list[] = {
+    ADD_TEST(device_scope),
+    ADD_TEST(workgroup_scope),
+    ADD_TEST(subgroup_scope),
+};
+
+
+int main(int argc, const char *argv[])
+{
+    return runTestHarness(argc, argv, ARRAY_SIZE(test_list), test_list, false,
+                          0);
+}