mux: validation fixes #23585

Job	Run time
manifest-check	2m 57s
LP64-WIP	3m 51s
build-windows (mnfst, imx8 imx8x)	9m 22s
build-windows (mnfst, lnl)	8m 14s
build-windows (mnfst, ptl)	9m 57s
build-linux (mnfst, ptl)	5m 21s
build-windows (-d, mnfst, lnl)	8m 4s
build-linux (mnfst, imx8 imx8x)	4m 22s
build-linux (mnfst, imx8m imx8ulp)	4m 23s
build-windows (mnfst, tgl)	8m 52s
build-windows (mnfst, imx8m imx8ulp)	8m 10s
build-linux (-d, mnfst, lnl)	4m 21s
build-linux (mnfst, mtl)	4m 2s
build-linux (mnfst, tgl)	4m 13s
build-linux (mnfst, wcl imx95)	5m 39s
build-windows (mnfst, mtl)	8m 9s
build-linux (mnfst, tgl-h)	4m 13s
build-windows (mnfst, tgl-h)	8m 27s
build-linux (mnfst, lnl)	4m 20s
compare-linux-win	33s
	1h 57m 30s

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