loongson/mirror: links for nv-dfm-core

loongson/mirror nv_dfm_core-3.1.31-py3-none-any.whl
loongson/mirror nv_dfm_core-3.1.29-py3-none-any.whl
loongson/mirror nv_dfm_core-3.1.27-py3-none-any.whl