zephyr: adapt to SOF not being a zephyr module #21636

Job	Run time
manifest-check	3m 20s
build-windows (ptl)	9m 24s
build-windows (imx8 imx8x imx8m imx8ulp)	15m 21s
build-windows (mtl lnl)	12m 20s
LP64-WIP	3m 44s
build-windows (tgl tgl-h)	10m 42s
build-windows (-d, lnl)	10m 7s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 51s
build-linux (mnfst, ptl)	4m 37s
build-linux (zmain, ptl)	4m 28s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 37s
build-linux (zmain, tgl tgl-h)	5m 34s
build-linux (mnfst, tgl tgl-h)	5m 33s
build-linux (-d, mnfst, lnl)	4m 25s
build-linux (mnfst, mtl lnl)	5m 56s
build-linux (mnfst, --all)	16m 58s
build-linux (zmain, mtl lnl)	5m 54s
compare-linux-win	51s
	2h 12m 42s

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