[NFC] Change the name of the default device provided by the new registration framework (#2186)

The code base uses a mix of 'device' and 'deviceID'. I suggest we
standardise on 'device' which is shorter and slightly more prevalent.

Contributes to #2181

Signed-off-by: Kevin Petit <kevin.petit@arm.com>

test_conformance/SVM/test_byte_granularity.cpp

@@ -58,7 +58,7 @@ REGISTER_TEST(svm_byte_granularity)
     cl_uint num_devices = 0;
     cl_int err = CL_SUCCESS;
 
-    err = create_cl_objects(deviceID, &byte_manipulation_kernels[0],
+    err = create_cl_objects(device, &byte_manipulation_kernels[0],
                             &contextWrapper, &program, &queues[0], &num_devices,
                             CL_DEVICE_SVM_FINE_GRAIN_BUFFER);
     context = contextWrapper;