build: start removing XTOS support #20750

Job	Run time
LP64-WIP	2m 59s
manifest-check	48s
build-windows (mtl lnl)	8m 6s
build-windows (imx8 imx8x imx8m imx8ulp)	9m 32s
build-windows (tgl tgl-h)	7m 8s
build-windows (-d, lnl)	5m 54s
build-linux (mnfst, ptl)	3m 11s
build-windows (ptl)	6m 19s
build-linux (mnfst, mtl lnl)	3m 40s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	3m 10s
build-linux (mnfst, --all)	3m 7s
build-linux (-d, mnfst, lnl)	3m 8s
build-linux (zmain, ptl)	3m 21s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	3m 9s
build-linux (zmain, mtl lnl)	3m 38s
build-linux (zmain, tgl tgl-h)	3m 23s
build-linux (mnfst, tgl tgl-h)	3m 6s
compare-linux-win	26s
	1h 14m 5s

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