Add support for RISC-V #8662

Job	Run time
build / Build	6m 37s
Integration Tests (certrotation)	1m 22s
Integration Tests (cacertrotation)	1m 16s
Integration Tests (etcdrestore)	1m 26s
Integration Tests (localstorage)	1m 29s
Integration Tests (startup)	7m 20s
Integration Tests (custometcdargs)	26s
Integration Tests (etcdsnapshot)	7m 26s
Integration Tests (kubeflags)	6m 53s
Integration Tests (longhorn)	2m 41s
Integration Tests (secretsencryption)	2m 11s
Integration Tests (flannelnone)	1m 1s
	40m 8s

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