add loongarch64 support for archutil #2076

Job	Run time
prepare	1s
test / prepare	1m 48s
test / run (containerd, ./frontend/dockerfile, integration)	4m 27s
test / run (containerd, ./frontend/dockerfile, dockerfile)	5m 49s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 16s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	5m 57s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 10s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	5m 32s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 26s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 4s
test / run (oci, ./frontend/dockerfile, integration)	3m 57s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 0s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 15s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	4m 49s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	3m 58s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 38s
image (mainline)	4m 57s
image (labs)	4m 53s
release	0s
	1h 19m 57s

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