sys/linux/test: Add tests for ARM QEMU emulation #15119

Job	Run time
build	14m 22s
dashboard	4m 1s
aux	4m 43s
arch (presubmit_arch_linux)	10m 38s
gvisor	4m 10s
arch (presubmit_arch_freebsd)	6m 26s
old	6m 45s
arch (presubmit_arch_netbsd)	4m 22s
race	8m 52s
arch (presubmit_arch_openbsd)	4m 15s
race_dashboard	3m 36s
arch (presubmit_arch_darwin)	4m 18s
arch (presubmit_arch_windows)	3m 20s
arch (presubmit_arch_executor)	3m 12s
	1h 23m 0s

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