xtos: cleanup Kconfig.xtos, remove CONFIG_DMA_GW and other unused options #21225

Job	Run time
manifest-check	57s
build-windows (mtl lnl)	7m 46s
build-windows (imx8 imx8x imx8m imx8ulp)	10m 0s
build-linux (mnfst, mtl lnl)	5m 36s
build-windows (ptl)	7m 21s
build-linux (mnfst, ptl)	4m 23s
LP64-WIP	3m 40s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 20s
build-linux (mnfst, --all)	16m 8s
build-linux (zmain, mtl lnl)	5m 51s
build-linux (-d, mnfst, lnl)	4m 11s
build-windows (tgl tgl-h)	8m 7s
build-windows (-d, lnl)	7m 40s
build-linux (zmain, tgl tgl-h)	5m 17s
build-linux (zmain, ptl)	4m 49s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 37s
build-linux (mnfst, tgl tgl-h)	5m 28s
compare-linux-win	2m 31s
	1h 52m 42s

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