Add audiobusio.I2SOut() support to Zephyr #2025

Job	Run time
scheduler	50s
windows	26m 59s
mpy-cross-mac	27s
docs	14m 22s
windows-zephyr (windows-2025)	13m 3s
windows-zephyr (windows-2022)	10m 40s
mpy-cross / build (static-raspbian)	50s
mpy-cross / build (static)	19s
tests / zephyr	19m 15s
mpy-cross / build (static-aarch64)	38s
mpy-cross / build (static-mingw)	43s
tests / run (native_mpy)	34s
tests / run (mpy)	43s
tests / run (all)	1m 6s
tests / run (native)	48s
ports	0s
	1h 31m 17s

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