loongson/mirror: links for cbpi4-bm-steps

loongson/mirror cbpi4-BM_Steps-0.0.9.tar.gz
loongson/mirror cbpi4-BM_Steps-0.0.8.tar.gz
loongson/mirror cbpi4-BM_Steps-0.0.3.tar.gz
loongson/mirror cbpi4-BM_Steps-0.0.2.1.tar.gz
loongson/mirror cbpi4-BM_Steps-0.0.2.tar.gz