sys/linux: add basic examples of vusb variants #17543

Job	Run time
dashboard	2m 14s
arch (presubmit_arch_executor)	3m 17s
arch (presubmit_arch_openbsd)	3m 38s
build	3m 1s
aux	4m 28s
arch (presubmit_arch_netbsd)	4m 3s
arch (presubmit_arch_windows)	3m 32s
arch (presubmit_arch_darwin)	3m 35s
arch (presubmit_arch_freebsd)	6m 9s
arch (presubmit_arch_linux)	10m 51s
race	9m 30s
old	7m 2s
race_dashboard	2m 58s
gvisor	3m 59s
	1h 8m 17s

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