zephyr: stop using CONFIG_SOF to identify Zephyr build (w/ Zephyr Nov/20 update) #21874

Job	Run time
manifest-check	3m 14s
build-windows (mtl lnl)	11m 5s
build-windows (tgl tgl-h)	10m 57s
LP64-WIP	3m 53s
build-linux (mnfst, mtl lnl)	5m 44s
build-windows (-d, lnl)	9m 1s
build-linux (mnfst, ptl)	4m 35s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 51s
build-linux (mnfst, tgl tgl-h)	5m 29s
build-windows (ptl)	9m 28s
build-windows (imx8 imx8x imx8m imx8ulp)	14m 50s
build-linux (zmain, ptl)	4m 14s
build-linux (mnfst, --all)	17m 12s
build-linux (zmain, tgl tgl-h)	5m 30s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 31s
build-linux (-d, mnfst, lnl)	4m 23s
build-linux (zmain, mtl lnl)	5m 54s
compare-linux-win	44s
	2h 9m 35s

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