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