COMPMID-417 Checking CL non uniform support at runtime.

What have been done in the ticket are:
1. Add support to check whether cl-non-unform-workgroup is supported at
runtime
2. Add helper function to check the CL version at runtime
3. Add boolen to check whether CLSecheduler's init has been called.

Change-Id: I6e6df8eb5cebfac7229aa406242bb183477fd191
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/80265
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/arm_compute/core/CL/CLHelpers.h b/arm_compute/core/CL/CLHelpers.h
index 5234ae1..01980d9 100644
--- a/arm_compute/core/CL/CLHelpers.h
+++ b/arm_compute/core/CL/CLHelpers.h
@@ -102,5 +102,20 @@
  * @return the GPU target which shows the arch
  */
 GPUTarget get_arch_from_target(GPUTarget target);
+
+/** Helper function to get the highest OpenCL version supported
+ *
+ * @param[in] device A CL device
+ *
+ * @return the highest OpenCL version supported
+ */
+CLVersion get_cl_version(const cl::Device &device);
+/** Helper function to check whether the arm_non_uniform_work_group_size extension is supported
+ *
+ * @param[in] device A CL device
+ *
+ * @return True if the extension is supported
+ */
+bool non_uniform_workgroup_support(const cl::Device &device);
 }
 #endif /* __ARM_COMPUTE_CLHELPERS_H__ */