add loongarch64 support for archutil #2069

Job	Run time
prepare	1s
test / prepare	5m 12s
test / run (containerd, ./frontend/dockerfile, integration)	4m 10s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 16s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 36s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	5m 32s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 36s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 13s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 40s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	7m 13s
test / run (oci, ./frontend/dockerfile, integration)	3m 54s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 38s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 20s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 15s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 24s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 2s
image (mainline)	5m 6s
image (labs)	4m 37s
release	0s
	1h 26m 45s

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