The document talks about fine grained buffer SVM. Unfortunately, HD5300 supports only Coarse grained buffer SVM. The globally coherent memory is supported on the HD5500+ chips with January 15, 2015 drivers. After creating an Intel OpenCL 2.0 device, you should be able to query for and find:
Could you run CPU-Z and provide a CPU and Graphics tabs screenshots? If you have E0/F0 stepping, fine grained SVM might work with the latest driver.