Add `Device::syncobj_eventfd` #335

Job	Run time
format	17s
check	1m 25s
doc	28s
check-minimal	38s
test (bindings, ubuntu-22.04, stable, i686-unknown-linux-gnu)	52s
test (bindings, ubuntu-22.04, stable, x86_64-unknown-linux-gnu)	23s
test (bindings, ubuntu-22.04, stable, arm-unknown-linux-gnueabihf)	1m 21s
test (bindings, ubuntu-22.04, stable, armv7-unknown-linux-gnueabihf)	58s
test (bindings, ubuntu-22.04, stable, aarch64-unknown-linux-gnu)	28s
test (bindings, ubuntu-22.04, stable, riscv64gc-unknown-linux-gnu)	48s
test (channels, ubuntu-22.04, stable, x86_64-unknown-linux-gnu)	39s
test (channels, ubuntu-22.04, beta, x86_64-unknown-linux-gnu)	33s
test (channels, ubuntu-22.04, nightly, x86_64-unknown-linux-gnu)	46s
compare-bindings	3s
publish	0s
update-bindings	0s
	9m 39s

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