Add `Device::syncobj_eventfd` #336

Job	Run time
check-minimal	38s
doc	20s
check	1m 24s
format	8s
test (bindings, ubuntu-22.04, stable, i686-unknown-linux-gnu)	47s
test (bindings, ubuntu-22.04, stable, x86_64-unknown-linux-gnu)	37s
test (bindings, ubuntu-22.04, stable, arm-unknown-linux-gnueabihf)	32s
test (bindings, ubuntu-22.04, stable, armv7-unknown-linux-gnueabihf)	49s
test (bindings, ubuntu-22.04, stable, aarch64-unknown-linux-gnu)	47s
test (bindings, ubuntu-22.04, stable, riscv64gc-unknown-linux-gnu)	2m 10s
test (channels, ubuntu-22.04, stable, x86_64-unknown-linux-gnu)	31s
test (channels, ubuntu-22.04, beta, x86_64-unknown-linux-gnu)	33s
test (channels, ubuntu-22.04, nightly, x86_64-unknown-linux-gnu)	32s
compare-bindings	7s
publish	0s
update-bindings	5s
	10m 0s

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