Wrong include path `#include "include/CL/opencl.hpp"`

[ggardet]

With #1181
#include <CL/opencl.hpp> has been moved to arm_compute/core/CL/cl_definitions.h but has been changed to #include "include/CL/opencl.hpp"

This breaks when ComputeLibrary is used to build armnn with openCL enabled. (Found on openSUSE Tumbleweed)
Error log from armnn build:

[   16s] /usr/include/arm_compute/core/CL/cl_definitions.h:28:10: fatal error: include/CL/opencl.hpp: No such file or directory
[   16s]    28 | #include "include/CL/opencl.hpp"

Changing #include "include/CL/opencl.hpp" to #include <CL/opencl.hpp> in arm_compute/core/CL/cl_definitions.h fixes the issue.