vmm: support VFIO device #669

Job	Run time
tests (vmm/sandbox, --all-features)	3m 3s
checks (vmm/sandbox, --all-features)	1m 28s
tests (vmm/task, --all-features)	2m 45s
checks (vmm/task, --all-features)	1m 44s
tests (shim, --all-features)	2m 35s
checks (shim, --all-features)	1m 45s
tests (quark, --all-features)	2m 41s
checks (quark, --all-features)	1m 44s
tests (wasm, --features=wasmedge, 0.11.2)	2m 44s
checks (wasm, --features=wasmedge, 0.11.2)	1m 45s
tests (wasm, --features=wasmtime)	3m 16s
checks (wasm, --features=wasmtime)	1m 34s
	27m 4s

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