Add CL_DEVICE_NAME to clDeviceInfo File (#836)

- [x] Add `CL_DEVICE_NAME` to list of device properties printed into the
clDeviceInfo file for offline compilation testing.
- [x] Add `get_device_name` helper function.
- [x] Update offline compiler interface explanation file with
`CL_DEVICE_NAME` and `CL_DEVICE_IMAGE_SUPPORT` which was missed from
this file when added.

test_common/harness/kernelHelpers.cpp

@@ -374,6 +374,8 @@ static cl_int get_cl_device_info_str(const cl_device_id device, const cl_uint de
     clDeviceInfoStream << "CL_DEVICE_VERSION=\"" << versionString << "\"" << std::endl;
     clDeviceInfoStream << "CL_DEVICE_IMAGE_SUPPORT="
                        << (0 == checkForImageSupport(device)) << std::endl;
+    clDeviceInfoStream << "CL_DEVICE_NAME=\"" << get_device_name(device).c_str()
+                       << "\"" << std::endl;
 
     clDeviceInfo = clDeviceInfoStream.str();