vmm: support VFIO device #676

Job	Run time
tests (vmm/sandbox, --all-features)	3m 3s
tests (vmm/task, --all-features)	2m 40s
checks (vmm/sandbox, --all-features)	1m 37s
tests (shim, --all-features)	2m 39s
checks (vmm/task, --all-features)	1m 56s
tests (quark, --all-features)	2m 37s
checks (shim, --all-features)	1m 56s
tests (wasm, --features=wasmedge, 0.11.2)	3m 18s
checks (quark, --all-features)	1m 56s
tests (wasm, --features=wasmtime)	3m 12s
checks (wasm, --features=wasmedge, 0.11.2)	1m 57s
checks (wasm, --features=wasmtime)	1m 57s
	28m 48s

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