Add tests for cl_ext_immutable_memory_objects (#2286)

This change provides partial test coverage for
KhronosGroup/OpenCL-Docs#1280

Adding CTS tests for:
1. clEnqueueMapBuffer, clEnqueueMapImage.
2. Command buffer negative tests.
3. clSetKernelArgs negative tests.

The bulk of the tests is to make sure that the CL driver does not allow
writing to a memory object that is created with `CL_MEM_IMMUTABLE_EXT`
flag when used with the above APIs.

---------

Signed-off-by: Michael Rizkalla <michael.rizkalla@arm.com>

test_conformance/api/CMakeLists.txt

@@ -4,6 +4,7 @@ set(${MODULE_NAME}_SOURCES
          main.cpp
          negative_platform.cpp
          negative_queue.cpp
+         negative_enqueue_map_image.cpp
          test_api_consistency.cpp
          test_bool.cpp
          test_retain.cpp