user_driver: remove vfio dma trait (#810) #521

Job	Run time
build artifacts [x64-linux]	6m 58s
build artifacts [aarch64-linux]	6m 26s
build mdbook guide	1m 33s
build and check docs [x64-windows]	10m 31s
build openhcl [aarch64-linux]	11m 38s
build openhcl [x64-linux]	10m 14s
clippy [windows], unit tests [x64-windows]	19m 53s
clippy [linux, macos], unit tests [x64-linux]	11m 54s
clippy [linux-musl, misc nostd], unit tests [x64-linux-musl]	11m 38s
unit tests [aarch64-windows]	9m 8s
test flowey local backend	3m 5s
build and check docs [x64-linux]	2m 45s
xtask fmt (linux)	2m 23s
build artifacts (not for VMM tests) [aarch64-windows]	7m 6s
build artifacts (for VMM tests) [aarch64-windows]	18m 4s
build artifacts (not for VMM tests) [x64-windows]	6m 39s
build artifacts (for VMM tests) [x64-windows]	16m 24s
xtask fmt (windows)	5m 57s
publish openvmm.dev	48s
run vmm-tests [x64-linux]	3m 38s
run vmm-tests [x64-windows-amd]	9m 46s
run vmm-tests [x64-windows-intel]	8m 16s
run vmm-tests [aarch64-windows]	5m 58s
	3h 10m 42s

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