add port_yield from #10795 only on zephyr to fix #10822 #17663

Job	Run time
scheduler	2m 8s
mpy-cross-mac	29s
windows	-1s
tests / zephyr	3m 38s
mpy-cross / build (static-mingw)	45s
mpy-cross / build (static)	22s
tests / run (all)	59s
mpy-cross / build (static-aarch64)	33s
tests / run (native)	50s
tests / run (native_mpy)	43s
tests / run (mpy)	39s
mpy-cross / build (static-raspbian)	53s
windows-zephyr	-1s
docs	-1s
ports	0s
	11m 56s

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