Replaces XNN_FLAG_KEEP_DIM --> XNN_FLAG_REDUCE_DIM to maintain existing behaviour
Replaces XNN_FLAG_KEEP_DIM --> XNN_FLAG_REDUCE_DIM to maintain existing behaviour

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10684 from openxla:cudnn_fusion_more_op_types 210f8aaae3206264379c9f1ff5f70f24ffca4a14
