zephyr: add Zephyr version of sof/init.h #693

Job	Run time
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 0s
build-windows (imx8 imx8x imx8m imx8ulp)	7m 28s
build-linux (mnfst, mtl)	4m 16s
build-linux (mnfst, lnl)	4m 27s
build-windows (mtl)	5m 45s
build-windows (tgl tgl-h)	6m 20s
build-linux (mnfst, tgl tgl-h)	5m 21s
build-windows (-d, mtl)	6m 15s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	5m 50s
build-linux (zmain, mtl)	4m 19s
build-linux (zmain, lnl)	4m 21s
LP64-WIP	4m 2s
build-linux (zmain, tgl tgl-h)	5m 21s
build-linux (-d, mnfst, mtl)	4m 33s
manifest-check	46s
build-linux (mnfst, --all)	12m 14s
compare-linux-win	28s
	1h 27m 46s

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