vmm: support VFIO device #678

Job	Run time
tests (vmm/sandbox, --all-features)	3m 15s
checks (vmm/sandbox, --all-features)	4m 50s
tests (vmm/task, --all-features)	2m 42s
checks (vmm/task, --all-features)	4m 18s
tests (shim, --all-features)	2m 32s
checks (shim, --all-features)	4m 15s
tests (quark, --all-features)	2m 29s
checks (quark, --all-features)	4m 7s
tests (wasm, --features=wasmedge, 0.11.2)	2m 40s
checks (wasm, --features=wasmedge, 0.11.2)	4m 7s
tests (wasm, --features=wasmtime)	3m 29s
checks (wasm, --features=wasmtime)	4m 34s
	43m 18s

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