vmm: support VFIO device #670

Job	Run time
tests (vmm/sandbox, --all-features)	3m 17s
tests (vmm/task, --all-features)	2m 35s
checks (vmm/sandbox, --all-features)	1m 32s
tests (shim, --all-features)	2m 36s
checks (vmm/task, --all-features)	1m 49s
tests (quark, --all-features)	2m 50s
checks (shim, --all-features)	1m 49s
tests (wasm, --features=wasmedge, 0.11.2)	2m 50s
checks (quark, --all-features)	1m 48s
tests (wasm, --features=wasmtime)	3m 21s
checks (wasm, --features=wasmedge, 0.11.2)	1m 49s
checks (wasm, --features=wasmtime)	1m 49s
	28m 5s

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