updated find_path for opencl so it doesn't break cmake if opencl dir is passed
updated find_path for opencl so it doesn't break cmake if opencl dir is passed

 and opencl path is not found

Change-Id: I288dccef8d871bdf4e3e146de9337c1938c231ac

ROCm-Developer-Tools/ROCclr,ROCm-Developer-Tools/ROCclr