Add audiobusio.I2SOut() support to Zephyr #17915

Job	Run time
scheduler	2m 7s
mpy-cross-mac	24s
docs	13m 20s
tests / run (all)	1m 1s
tests / run (native)	45s
mpy-cross / build (static)	19s
tests / run (native_mpy)	40s
tests / run (mpy)	37s
mpy-cross / build (static-raspbian)	55s
mpy-cross / build (static-mingw)	53s
mpy-cross / build (static-aarch64)	7m 19s
tests / zephyr	18m 2s
windows	0s
windows-zephyr	0s
ports	-1s
	46m 21s

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