build: remove XTOS-specific sections from cmake lists #20783

Job	Run time
manifest-check	56s
LP64-WIP	3m 29s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 40s
build-windows (mtl lnl)	7m 5s
build-linux (mnfst, tgl tgl-h)	5m 10s
build-linux (mnfst, ptl)	4m 36s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 3s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 13s
build-windows (-d, lnl)	5m 58s
build-windows (ptl)	6m 50s
build-windows (tgl tgl-h)	6m 52s
build-linux (mnfst, mtl lnl)	5m 20s
build-linux (zmain, mtl lnl)	5m 12s
build-linux (zmain, ptl)	4m 9s
build-linux (zmain, tgl tgl-h)	4m 50s
build-linux (mnfst, --all)	15m 51s
build-linux (-d, mnfst, lnl)	4m 2s
compare-linux-win	1m 49s
	1h 43m 5s

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