build: remove scheduling-related XTOS remainders #20834

Job	Run time
LP64-WIP	3m 22s
manifest-check	45s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 40s
build-windows (mtl lnl)	6m 41s
build-windows (-d, lnl)	6m 3s
build-windows (ptl)	5m 41s
build-windows (tgl tgl-h)	6m 18s
build-linux (mnfst, tgl tgl-h)	4m 49s
build-linux (mnfst, mtl lnl)	5m 20s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 37s
build-linux (mnfst, ptl)	4m 25s
build-linux (zmain, ptl)	3m 53s
build-linux (zmain, tgl tgl-h)	5m 6s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 2s
build-linux (mnfst, --all)	15m 30s
build-linux (-d, mnfst, lnl)	4m 2s
build-linux (zmain, mtl lnl)	5m 34s
compare-linux-win	1m 15s
	1h 40m 3s

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